diff --git a/.circleci/config.yml b/.circleci/config.yml
index e452a6a2f4..c53ed45a72 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -21,6 +21,10 @@ executors:
 
 jobs:
   setup-multi-product-repositories:
+    parameters:
+      target-branch:
+        type: string
+        default: '$(curl -s -H "Authorization: token ${GITHUB_TOKEN}" $(echo https://api.github.com/repos/${CIRCLE_PULL_REQUEST:19} | sed "s/\/pull\//\/pulls\//") | jq ".base.ref" | tr -d "\042" )'
     working_directory: /mnt/ramdisk/mattermost-server
     docker:
       - image: cimg/go:1.18
@@ -31,7 +35,7 @@ jobs:
           cd ..
           git clone --depth=1 --no-single-branch https://github.com/mattermost/focalboard.git
           cd focalboard
-          git checkout $CIRCLE_BRANCH || git checkout rolling-stable
+          git checkout $CIRCLE_BRANCH || git checkout <<parameters.target-branch>> || git checkout rolling-stable
           echo $(git rev-parse HEAD)
           cd ../mattermost-server
           make setup-go-work
@@ -136,7 +140,7 @@ jobs:
           command: |
             cd mattermost-server
             make modules-tidy
-            if [[ -n $(git status --porcelain) ]]; then echo "Please tidy up the Go modules using make modules-tidy"; exit 1; fi
+            if [[ -n $(git status --porcelain) ]]; then echo "Please tidy up the Go modules using make modules-tidy"; git diff; exit 1; fi
   check-store-layers:
     docker:
       - image: cimg/go:1.18
@@ -487,6 +491,8 @@ workflows:
   untagged-build:
     jobs:
       - setup-multi-product-repositories:
+          context:
+            - matterbuild-github-token
           filters:
             branches:
               ignore:
@@ -652,6 +658,8 @@ workflows:
   release-build:
     jobs:
       - setup-multi-product-repositories:
+          context:
+            - matterbuild-github-token
           filters:
             branches:
               only:
diff --git a/Makefile b/Makefile
index ede4f447d0..7c8de4311b 100644
--- a/Makefile
+++ b/Makefile
@@ -155,7 +155,7 @@ PLUGIN_PACKAGES += mattermost-plugin-confluence-v1.3.0
 PLUGIN_PACKAGES += mattermost-plugin-custom-attributes-v1.3.1
 PLUGIN_PACKAGES += mattermost-plugin-github-v2.1.4
 PLUGIN_PACKAGES += mattermost-plugin-gitlab-v1.5.2
-PLUGIN_PACKAGES += mattermost-plugin-playbooks-v1.34.0
+PLUGIN_PACKAGES += mattermost-plugin-playbooks-v1.35.0
 PLUGIN_PACKAGES += mattermost-plugin-jenkins-v1.1.0
 PLUGIN_PACKAGES += mattermost-plugin-jira-v3.2.2
 PLUGIN_PACKAGES += mattermost-plugin-jitsi-v2.0.1
diff --git a/app/emoji.go b/app/emoji.go
index 48e7773b5a..9982428711 100644
--- a/app/emoji.go
+++ b/app/emoji.go
@@ -14,7 +14,6 @@ import (
 	"image/draw"
 	"image/gif"
 	_ "image/jpeg"
-	"image/png"
 	"io"
 	"mime/multipart"
 	"net/http"
@@ -31,7 +30,7 @@ import (
 )
 
 const (
-	MaxEmojiFileSize       = 1 << 20 // 1 MB
+	MaxEmojiFileSize       = 1 << 19 // 512 KiB
 	MaxEmojiWidth          = 128
 	MaxEmojiHeight         = 128
 	MaxEmojiOriginalWidth  = 1028
@@ -155,8 +154,8 @@ func (a *App) UploadEmojiImage(c request.CTX, id string, imageData *multipart.Fi
 				return model.NewAppError("uploadEmojiImage", "api.emoji.upload.large_image.decode_error", nil, "", http.StatusBadRequest).Wrap(err)
 			}
 
-			resized_image := resizeEmoji(img, config.Width, config.Height)
-			if err := png.Encode(newbuf, resized_image); err != nil {
+			resizedImg := resizeEmoji(img, config.Width, config.Height)
+			if err := a.ch.imgEncoder.EncodePNG(newbuf, resizedImg); err != nil {
 				return model.NewAppError("uploadEmojiImage", "api.emoji.upload.large_image.encode_error", nil, "", http.StatusBadRequest).Wrap(err)
 			}
 			buf = newbuf
diff --git a/app/imaging/encode.go b/app/imaging/encode.go
index 1afb3159d9..d10f73c91a 100644
--- a/app/imaging/encode.go
+++ b/app/imaging/encode.go
@@ -45,7 +45,9 @@ func NewEncoder(opts EncoderOptions) (*Encoder, error) {
 		e.sem = make(chan struct{}, opts.ConcurrencyLevel)
 	}
 	e.opts = opts
-	e.pngEncoder = &png.Encoder{}
+	e.pngEncoder = &png.Encoder{
+		CompressionLevel: png.BestCompression,
+	}
 	return &e, nil
 }
 
diff --git a/app/server.go b/app/server.go
index dc66353ee4..f7a9e9b912 100644
--- a/app/server.go
+++ b/app/server.go
@@ -595,7 +595,7 @@ func (s *Server) startInterClusterServices(license *model.License) error {
 	// Shared Channels service
 
 	// License check
-	if !*license.Features.SharedChannels {
+	if !license.HasSharedChannels() {
 		mlog.Debug("License does not have shared channels enabled")
 		return nil
 	}
diff --git a/app/slashcommands/command_invite.go b/app/slashcommands/command_invite.go
index 3bf4931324..d4abda9054 100644
--- a/app/slashcommands/command_invite.go
+++ b/app/slashcommands/command_invite.go
@@ -10,7 +10,6 @@ import (
 	"github.com/mattermost/mattermost-server/v6/app/request"
 	"github.com/mattermost/mattermost-server/v6/model"
 	"github.com/mattermost/mattermost-server/v6/shared/i18n"
-	"github.com/mattermost/mattermost-server/v6/shared/mlog"
 )
 
 type InviteProvider struct {
@@ -38,137 +37,177 @@ func (*InviteProvider) GetCommand(a *app.App, T i18n.TranslateFunc) *model.Comma
 	}
 }
 
-func (*InviteProvider) DoCommand(a *app.App, c request.CTX, args *model.CommandArgs, message string) *model.CommandResponse {
+func (i *InviteProvider) DoCommand(a *app.App, c request.CTX, args *model.CommandArgs, message string) *model.CommandResponse {
+	return &model.CommandResponse{
+		Text:         i.doCommand(a, c, args, message),
+		ResponseType: model.CommandResponseTypeEphemeral,
+	}
+}
+
+func (i *InviteProvider) doCommand(a *app.App, c request.CTX, args *model.CommandArgs, message string) string {
 	if message == "" {
-		return &model.CommandResponse{
-			Text:         args.T("api.command_invite.missing_message.app_error"),
-			ResponseType: model.CommandResponseTypeEphemeral,
+		return args.T("api.command_invite.missing_message.app_error")
+	}
+
+	resps := &[]string{}
+
+	targetUsers, targetChannels, resp := i.parseMessage(a, c, args, resps, message)
+	if resp != "" {
+		return resp
+	}
+
+	// Verify that the inviter has permissions to invite users to the every channel.
+	targetChannels = i.checkPermissions(a, c, args, resps, targetUsers[0], targetChannels)
+
+	for _, targetUser := range targetUsers {
+		for _, targetChannel := range targetChannels {
+			if resp = i.addUserToChannel(a, c, args, targetUser, targetChannel); resp != "" {
+				*resps = append(*resps, resp)
+				continue
+			}
+			if args.ChannelId != targetChannel.Id {
+				*resps = append(*resps, args.T("api.command_invite.success", map[string]any{
+					"User":    targetUser.Username,
+					"Channel": targetChannel.Name,
+				}))
+			}
 		}
 	}
 
-	splitMessage := strings.SplitN(message, " ", 2)
-	targetUsername := splitMessage[0]
-	targetUsername = strings.TrimPrefix(targetUsername, "@")
+	if len(*resps) > 0 {
+		return strings.Join(*resps, "\n")
+	}
 
-	userProfile, nErr := a.Srv().Store().User().GetByUsername(targetUsername)
-	if nErr != nil {
-		mlog.Error(nErr.Error())
-		return &model.CommandResponse{
-			Text:         args.T("api.command_invite.missing_user.app_error"),
-			ResponseType: model.CommandResponseTypeEphemeral,
+	return ""
+}
+
+func (i *InviteProvider) parseMessage(a *app.App, c request.CTX, args *model.CommandArgs, resps *[]string, message string) ([]*model.User, []*model.Channel, string) {
+	splitMessage := strings.Split(message, " ")
+
+	targetUsers := make([]*model.User, 0, 1)
+	targetChannels := make([]*model.Channel, 0)
+
+	for j, msg := range splitMessage {
+		if msg == "" {
+			continue
 		}
+
+		if msg[0] == '@' || (msg[0] != '~' && j == 0) {
+			targetUsername := strings.TrimPrefix(msg, "@")
+			userProfile := i.getUserProfile(a, targetUsername)
+			if userProfile == nil {
+				*resps = append(*resps, args.T("api.command_invite.missing_user.app_error", map[string]any{
+					"User": targetUsername,
+				}))
+				continue
+			}
+			targetUsers = append(targetUsers, userProfile)
+		} else {
+			targetChannelName := strings.TrimPrefix(msg, "~")
+			channelToJoin, err := a.GetChannelByName(c, targetChannelName, args.TeamId, false)
+			if err != nil {
+				*resps = append(*resps, args.T("api.command_invite.channel.error", map[string]any{
+					"Channel": targetChannelName,
+				}))
+				continue
+			}
+			targetChannels = append(targetChannels, channelToJoin)
+		}
+	}
+
+	if len(targetUsers) == 0 {
+		if len(*resps) != 0 {
+			return nil, nil, strings.Join(*resps, "\n")
+		}
+		return nil, nil, args.T("api.command_invite.missing_message.app_error")
+	}
+
+	if len(targetChannels) == 0 {
+		if len(*resps) != 0 {
+			return nil, nil, strings.Join(*resps, "\n")
+		}
+
+		channelToJoin, err := a.GetChannel(c, args.ChannelId)
+		if err != nil {
+			return nil, nil, args.T("api.command_invite.channel.app_error")
+		}
+		targetChannels = append(targetChannels, channelToJoin)
+	}
+
+	return targetUsers, targetChannels, ""
+}
+
+func (i *InviteProvider) getUserProfile(a *app.App, username string) *model.User {
+	userProfile, nErr := a.Srv().Store().User().GetByUsername(username)
+	if nErr != nil {
+		return nil
 	}
 
 	if userProfile.DeleteAt != 0 {
-		return &model.CommandResponse{
-			Text:         args.T("api.command_invite.missing_user.app_error"),
-			ResponseType: model.CommandResponseTypeEphemeral,
-		}
+		return nil
 	}
 
-	var channelToJoin *model.Channel
+	return userProfile
+}
+
+func (i *InviteProvider) checkPermissions(a *app.App, c request.CTX, args *model.CommandArgs, resps *[]string, targetUser *model.User, targetChannels []*model.Channel) []*model.Channel {
 	var err *model.AppError
-	// User set a channel to add the invited user
-	if len(splitMessage) > 1 && splitMessage[1] != "" {
-		targetChannelName := strings.TrimPrefix(strings.TrimSpace(splitMessage[1]), "~")
-
-		if channelToJoin, err = a.GetChannelByName(c, targetChannelName, args.TeamId, false); err != nil {
-			return &model.CommandResponse{
-				Text: args.T("api.command_invite.channel.error", map[string]any{
-					"Channel": targetChannelName,
-				}),
-				ResponseType: model.CommandResponseTypeEphemeral,
+	validChannels := make([]*model.Channel, 0, len(targetChannels))
+	for _, targetChannel := range targetChannels {
+		switch targetChannel.Type {
+		case model.ChannelTypeOpen:
+			if !a.HasPermissionToChannel(c, args.UserId, targetChannel.Id, model.PermissionManagePublicChannelMembers) {
+				*resps = append(*resps, args.T("api.command_invite.permission.app_error", map[string]any{
+					"User":    targetUser.Username,
+					"Channel": targetChannel.Name,
+				}))
+				continue
 			}
-		}
-	} else {
-		channelToJoin, err = a.GetChannel(c, args.ChannelId)
-		if err != nil {
-			return &model.CommandResponse{
-				Text:         args.T("api.command_invite.channel.app_error"),
-				ResponseType: model.CommandResponseTypeEphemeral,
-			}
-		}
-	}
-
-	// Permissions Check
-	switch channelToJoin.Type {
-	case model.ChannelTypeOpen:
-		if !a.HasPermissionToChannel(c, args.UserId, channelToJoin.Id, model.PermissionManagePublicChannelMembers) {
-			return &model.CommandResponse{
-				Text: args.T("api.command_invite.permission.app_error", map[string]any{
-					"User":    userProfile.Username,
-					"Channel": channelToJoin.Name,
-				}),
-				ResponseType: model.CommandResponseTypeEphemeral,
-			}
-		}
-	case model.ChannelTypePrivate:
-		if !a.HasPermissionToChannel(c, args.UserId, channelToJoin.Id, model.PermissionManagePrivateChannelMembers) {
-			if _, err = a.GetChannelMember(c, channelToJoin.Id, args.UserId); err == nil {
-				// User doing the inviting is a member of the channel.
-				return &model.CommandResponse{
-					Text: args.T("api.command_invite.permission.app_error", map[string]any{
-						"User":    userProfile.Username,
-						"Channel": channelToJoin.Name,
-					}),
-					ResponseType: model.CommandResponseTypeEphemeral,
+		case model.ChannelTypePrivate:
+			if !a.HasPermissionToChannel(c, args.UserId, targetChannel.Id, model.PermissionManagePrivateChannelMembers) {
+				if _, err = a.GetChannelMember(c, targetChannel.Id, args.UserId); err == nil {
+					// User doing the inviting is a member of the channel.
+					*resps = append(*resps, args.T("api.command_invite.permission.app_error", map[string]any{
+						"User":    targetUser.Username,
+						"Channel": targetChannel.Name,
+					}))
+					continue
 				}
+				// User doing the inviting is *not* a member of the channel.
+				*resps = append(*resps, args.T("api.command_invite.private_channel.app_error", map[string]any{
+					"Channel": targetChannel.Name,
+				}))
+				continue
 			}
-			// User doing the inviting is *not* a member of the channel.
-			return &model.CommandResponse{
-				Text: args.T("api.command_invite.private_channel.app_error", map[string]any{
-					"Channel": channelToJoin.Name,
-				}),
-				ResponseType: model.CommandResponseTypeEphemeral,
-			}
-		}
-	default:
-		return &model.CommandResponse{
-			Text:         args.T("api.command_invite.directchannel.app_error"),
-			ResponseType: model.CommandResponseTypeEphemeral,
+		default:
+			*resps = append(*resps, args.T("api.command_invite.directchannel.app_error"))
+			continue
 		}
+		validChannels = append(validChannels, targetChannel)
 	}
+	return validChannels
+}
 
+func (i *InviteProvider) addUserToChannel(a *app.App, c request.CTX, args *model.CommandArgs, userProfile *model.User, channelToJoin *model.Channel) string {
 	// Check if user is already in the channel
-	_, err = a.GetChannelMember(c, channelToJoin.Id, userProfile.Id)
+	_, err := a.GetChannelMember(c, channelToJoin.Id, userProfile.Id)
 	if err == nil {
-		return &model.CommandResponse{
-			Text: args.T("api.command_invite.user_already_in_channel.app_error", map[string]any{
-				"User": userProfile.Username,
-			}),
-			ResponseType: model.CommandResponseTypeEphemeral,
-		}
+		return args.T("api.command_invite.user_already_in_channel.app_error", map[string]any{
+			"User": userProfile.Username,
+		})
 	}
 
-	if _, err := a.AddChannelMember(c, userProfile.Id, channelToJoin, app.ChannelMemberOpts{
-		UserRequestorID: args.UserId,
-	}); err != nil {
-		var text string
+	if _, err = a.AddChannelMember(c, userProfile.Id, channelToJoin, app.ChannelMemberOpts{UserRequestorID: args.UserId}); err != nil {
 		if err.Id == "api.channel.add_members.user_denied" {
-			text = args.T("api.command_invite.group_constrained_user_denied")
+			return args.T("api.command_invite.group_constrained_user_denied")
 		} else if err.Id == "app.team.get_member.missing.app_error" ||
 			err.Id == "api.channel.add_user.to.channel.failed.deleted.app_error" {
-			text = args.T("api.command_invite.user_not_in_team.app_error", map[string]any{
+			return args.T("api.command_invite.user_not_in_team.app_error", map[string]any{
 				"Username": userProfile.Username,
 			})
-		} else {
-			text = args.T("api.command_invite.fail.app_error")
-		}
-		return &model.CommandResponse{
-			Text:         text,
-			ResponseType: model.CommandResponseTypeEphemeral,
 		}
+		return args.T("api.command_invite.fail.app_error")
 	}
 
-	if args.ChannelId != channelToJoin.Id {
-		return &model.CommandResponse{
-			Text: args.T("api.command_invite.success", map[string]any{
-				"User":    userProfile.Username,
-				"Channel": channelToJoin.Name,
-			}),
-			ResponseType: model.CommandResponseTypeEphemeral,
-		}
-	}
-
-	return &model.CommandResponse{}
+	return ""
 }
diff --git a/app/slashcommands/command_invite_test.go b/app/slashcommands/command_invite_test.go
index 5de53899c0..5be71aaadf 100644
--- a/app/slashcommands/command_invite_test.go
+++ b/app/slashcommands/command_invite_test.go
@@ -17,46 +17,7 @@ func TestInviteProvider(t *testing.T) {
 	th := setup(t).initBasic()
 	defer th.tearDown()
 
-	channel := th.createChannel(th.BasicTeam, model.ChannelTypeOpen)
-	privateChannel := th.createChannel(th.BasicTeam, model.ChannelTypePrivate)
-	dmChannel := th.createDmChannel(th.BasicUser2)
-	privateChannel2 := th.createChannelWithAnotherUser(th.BasicTeam, model.ChannelTypePrivate, th.BasicUser2.Id)
-
-	basicUser3 := th.createUser()
-	th.linkUserToTeam(basicUser3, th.BasicTeam)
-	basicUser4 := th.createUser()
-	deactivatedUser := th.createUser()
-	th.App.UpdateActive(th.Context, deactivatedUser, false)
-
-	var err *model.AppError
-	_, err = th.App.CreateBot(th.Context, &model.Bot{
-		Username:    "bot1",
-		OwnerId:     basicUser3.Id,
-		Description: "a test bot",
-	})
-	require.Nil(t, err)
-
-	bot2, err := th.App.CreateBot(th.Context, &model.Bot{
-		Username:    "bot2",
-		OwnerId:     basicUser3.Id,
-		Description: "a test bot",
-	})
-	require.Nil(t, err)
-	_, _, err = th.App.AddUserToTeam(th.Context, th.BasicTeam.Id, bot2.UserId, basicUser3.Id)
-	require.Nil(t, err)
-
-	bot3, err := th.App.CreateBot(th.Context, &model.Bot{
-		Username:    "bot3",
-		OwnerId:     basicUser3.Id,
-		Description: "a test bot",
-	})
-	require.Nil(t, err)
-	_, _, err = th.App.AddUserToTeam(th.Context, th.BasicTeam.Id, bot3.UserId, basicUser3.Id)
-	require.Nil(t, err)
-	err = th.App.RemoveUserFromTeam(th.Context, th.BasicTeam.Id, bot3.UserId, basicUser3.Id)
-	require.Nil(t, err)
-
-	InviteP := InviteProvider{}
+	inviteProvider := InviteProvider{}
 	args := &model.CommandArgs{
 		T:         func(s string, args ...any) string { return s },
 		ChannelId: th.BasicChannel.Id,
@@ -64,115 +25,188 @@ func TestInviteProvider(t *testing.T) {
 		UserId:    th.BasicUser.Id,
 	}
 
-	userAndWrongChannel := "@" + th.BasicUser2.Username + " wrongchannel1"
-	userAndChannel := "@" + th.BasicUser2.Username + " ~" + channel.Name + " "
-	userAndDisplayChannel := "@" + th.BasicUser2.Username + " ~" + channel.DisplayName + " "
-	userAndPrivateChannel := "@" + th.BasicUser2.Username + " ~" + privateChannel.Name
-	userAndDMChannel := "@" + basicUser3.Username + " ~" + dmChannel.Name
-	userAndInvalidPrivate := "@" + basicUser3.Username + " ~" + privateChannel2.Name
-	deactivatedUserPublicChannel := "@" + deactivatedUser.Username + " ~" + channel.Name
-
-	groupChannel := th.createChannel(th.BasicTeam, model.ChannelTypePrivate)
-	_, err = th.App.AddChannelMember(th.Context, th.BasicUser.Id, groupChannel, app.ChannelMemberOpts{})
-	require.Nil(t, err)
-	groupChannel.GroupConstrained = model.NewBool(true)
-	groupChannel, _ = th.App.UpdateChannel(th.Context, groupChannel)
-
-	groupChannelNonUser := "@" + th.BasicUser2.Username + " ~" + groupChannel.Name
-
-	tests := []struct {
-		desc     string
-		expected string
-		msg      string
-	}{
-		{
-			desc:     "Missing user and channel in the command",
-			expected: "api.command_invite.missing_message.app_error",
-			msg:      "",
-		},
-		{
-			desc:     "User added in the current channel",
-			expected: "",
-			msg:      th.BasicUser2.Username,
-		},
-		{
-			desc:     "Add user to another channel not the current",
-			expected: "api.command_invite.success",
-			msg:      userAndChannel,
-		},
-		{
-			desc:     "try to add a user to a direct channel",
-			expected: "api.command_invite.directchannel.app_error",
-			msg:      userAndDMChannel,
-		},
-		{
-			desc:     "Try to add a user to a invalid channel",
-			expected: "api.command_invite.channel.error",
-			msg:      userAndWrongChannel,
-		},
-		{
-			desc:     "Try to add a user to an private channel",
-			expected: "api.command_invite.success",
-			msg:      userAndPrivateChannel,
-		},
-		{
-			desc:     "Using display channel name which is different form Channel name",
-			expected: "api.command_invite.channel.error",
-			msg:      userAndDisplayChannel,
-		},
-		{
-			desc:     "Invalid user to current channel",
-			expected: "api.command_invite.missing_user.app_error",
-			msg:      "@invalidUser123",
-		},
-		{
-			desc:     "Invalid user to current channel without @",
-			expected: "api.command_invite.missing_user.app_error",
-			msg:      "invalidUser321",
-		},
-		{
-			desc:     "try to add a user which is not part of the team",
-			expected: "api.command_invite.user_not_in_team.app_error",
-			msg:      basicUser4.Username,
-		},
-		{
-			desc:     "try to add a user not part of the group to a group channel",
-			expected: "api.command_invite.group_constrained_user_denied",
-			msg:      groupChannelNonUser,
-		},
-		{
-			desc:     "try to add a user to a private channel with no permission",
-			expected: "api.command_invite.private_channel.app_error",
-			msg:      userAndInvalidPrivate,
-		},
-		{
-			desc:     "try to add a deleted user to a public channel",
-			expected: "api.command_invite.missing_user.app_error",
-			msg:      deactivatedUserPublicChannel,
-		},
-		{
-			desc:     "try to add bot to a public channel",
-			expected: "api.command_invite.user_not_in_team.app_error",
-			msg:      "@bot1",
-		},
-		{
-			desc:     "add bot to a public channel",
-			expected: "",
-			msg:      "@bot2",
-		},
-		{
-			desc:     "try to add bot removed from a team to a public channel",
-			expected: "api.command_invite.user_not_in_team.app_error",
-			msg:      "@bot3",
-		},
+	runCmd := func(msg string, expected string) {
+		actual := inviteProvider.DoCommand(th.App, th.Context, args, msg).Text
+		assert.Equal(t, expected, actual)
 	}
 
-	for _, test := range tests {
-		t.Run(test.desc, func(t *testing.T) {
-			actual := InviteP.DoCommand(th.App, th.Context, args, test.msg).Text
-			assert.Equal(t, test.expected, actual)
-		})
+	checkIsMember := func(channelID, userID string) {
+		_, channelMemberErr := th.App.GetChannelMember(th.Context, channelID, userID)
+		require.Nil(t, channelMemberErr, "Failed to add user to channel")
 	}
+
+	checkIsNotMember := func(channelID, userID string) {
+		_, channelMemberErr := th.App.GetChannelMember(th.Context, channelID, userID)
+		require.NotNil(t, channelMemberErr, "Failed to add user to channel")
+	}
+
+	t.Run("try to add missing user and channel in the command", func(t *testing.T) {
+		msg := ""
+		runCmd(msg, "api.command_invite.missing_message.app_error")
+	})
+
+	t.Run("user added in the current channel", func(t *testing.T) {
+		msg := th.BasicUser2.Username
+		runCmd(msg, "")
+		checkIsMember(th.BasicChannel.Id, th.BasicUser2.Id)
+	})
+
+	t.Run("add user to another channel not the current", func(t *testing.T) {
+		channel := th.createChannel(th.BasicTeam, model.ChannelTypeOpen)
+
+		msg := "@" + th.BasicUser2.Username + " ~" + channel.Name + " "
+		runCmd(msg, "api.command_invite.success")
+		checkIsMember(channel.Id, th.BasicUser2.Id)
+	})
+
+	t.Run("add a user to a private channel", func(t *testing.T) {
+		privateChannel := th.createChannel(th.BasicTeam, model.ChannelTypePrivate)
+
+		msg := "@" + th.BasicUser2.Username + " ~" + privateChannel.Name
+		runCmd(msg, "api.command_invite.success")
+		checkIsMember(privateChannel.Id, th.BasicUser2.Id)
+	})
+
+	t.Run("add multiple users to multiple channels", func(t *testing.T) {
+		anotherUser := th.createUser()
+		th.linkUserToTeam(anotherUser, th.BasicTeam)
+		channel1 := th.createChannel(th.BasicTeam, model.ChannelTypeOpen)
+		channel2 := th.createChannel(th.BasicTeam, model.ChannelTypeOpen)
+
+		msg := "@" + th.BasicUser2.Username + " @" + anotherUser.Username + " ~" + channel1.Name + " ~" + channel2.Name
+		expected := "api.command_invite.success\napi.command_invite.success\napi.command_invite.success\napi.command_invite.success"
+		runCmd(msg, expected)
+		checkIsMember(channel1.Id, th.BasicUser2.Id)
+		checkIsMember(channel2.Id, th.BasicUser2.Id)
+		checkIsMember(channel1.Id, anotherUser.Id)
+		checkIsMember(channel2.Id, anotherUser.Id)
+	})
+
+	t.Run("adds multiple users even when some are invalid or already members", func(t *testing.T) {
+		channel := th.createChannel(th.BasicTeam, model.ChannelTypeOpen)
+		userAlreadyInChannel := th.createUser()
+		th.linkUserToTeam(userAlreadyInChannel, th.BasicTeam)
+		th.addUserToChannel(userAlreadyInChannel, channel)
+		userInTeam := th.createUser()
+		th.linkUserToTeam(userInTeam, th.BasicTeam)
+		userNotInTeam := th.createUser()
+
+		msg := "@invalidUser123 @" + userAlreadyInChannel.Username + " @" + userInTeam.Username + " @" + userNotInTeam.Username + " ~" + channel.Name
+		expected := "api.command_invite.missing_user.app_error\n"
+		expected += "api.command_invite.user_already_in_channel.app_error\n"
+		expected += "api.command_invite.success\n"
+		expected += "api.command_invite.user_not_in_team.app_error"
+		runCmd(msg, expected)
+		checkIsMember(channel.Id, userInTeam.Id)
+	})
+
+	t.Run("try to add a user to a direct channel", func(t *testing.T) {
+		anotherUser := th.createUser()
+		th.linkUserToTeam(anotherUser, th.BasicTeam)
+		directChannel := th.createDmChannel(th.BasicUser2)
+
+		msg := "@" + anotherUser.Username + " ~" + directChannel.Name
+		runCmd(msg, "api.command_invite.directchannel.app_error")
+		checkIsNotMember(directChannel.Id, anotherUser.Id)
+	})
+
+	t.Run("try to add a user to an invalid channel", func(t *testing.T) {
+		msg := "@" + th.BasicUser2.Username + " wrongchannel1"
+		runCmd(msg, "api.command_invite.channel.error")
+	})
+
+	t.Run("try to add a user using channel's display name", func(t *testing.T) {
+		channel := th.createChannel(th.BasicTeam, model.ChannelTypeOpen)
+
+		msg := "@" + th.BasicUser2.Username + " ~" + channel.DisplayName
+		runCmd(msg, "api.command_invite.channel.error")
+		checkIsNotMember(channel.Id, th.BasicUser2.Id)
+	})
+
+	t.Run("try add invalid user to current channel", func(t *testing.T) {
+		msg := "@invalidUser123"
+		runCmd(msg, "api.command_invite.missing_user.app_error")
+	})
+
+	t.Run("invalid user to current channel without @", func(t *testing.T) {
+		msg := "invalidUser123"
+		runCmd(msg, "api.command_invite.missing_user.app_error")
+	})
+
+	t.Run("try to add a user which is not part of the team", func(t *testing.T) {
+		anotherUser := th.createUser()
+		// Do not add user to the team
+
+		msg := anotherUser.Username
+		runCmd(msg, "api.command_invite.user_not_in_team.app_error")
+	})
+
+	t.Run("try to add a user not part of the group to a group channel", func(t *testing.T) {
+		groupChannel := th.createChannel(th.BasicTeam, model.ChannelTypePrivate)
+		_, err := th.App.AddChannelMember(th.Context, th.BasicUser.Id, groupChannel, app.ChannelMemberOpts{})
+		require.Nil(t, err)
+		groupChannel.GroupConstrained = model.NewBool(true)
+		groupChannel, _ = th.App.UpdateChannel(th.Context, groupChannel)
+
+		msg := "@" + th.BasicUser2.Username + " ~" + groupChannel.Name
+		runCmd(msg, "api.command_invite.group_constrained_user_denied")
+		checkIsNotMember(groupChannel.Id, th.BasicUser2.Id)
+	})
+
+	t.Run("try to add a user to a private channel with no permission", func(t *testing.T) {
+		anotherUser := th.createUser()
+		th.linkUserToTeam(anotherUser, th.BasicTeam)
+		privateChannel := th.createChannelWithAnotherUser(th.BasicTeam, model.ChannelTypePrivate, th.BasicUser2.Id)
+
+		msg := "@" + anotherUser.Username + " ~" + privateChannel.Name
+		runCmd(msg, "api.command_invite.private_channel.app_error")
+		checkIsNotMember(privateChannel.Id, anotherUser.Id)
+	})
+
+	t.Run("try to add a deleted user to a public channel", func(t *testing.T) {
+		channel := th.createChannel(th.BasicTeam, model.ChannelTypeOpen)
+		deactivatedUser := th.createUser()
+		_, appErr := th.App.UpdateActive(th.Context, deactivatedUser, false)
+		require.Nil(t, appErr)
+
+		msg := "@" + deactivatedUser.Username + " ~" + channel.Name
+		runCmd(msg, "api.command_invite.missing_user.app_error")
+		checkIsNotMember(channel.Id, deactivatedUser.Id)
+	})
+
+	t.Run("add bot to a public channel", func(t *testing.T) {
+		bot, appErr := th.App.CreateBot(th.Context, &model.Bot{Username: "bot_" + model.NewId(), OwnerId: th.BasicUser2.Id})
+		require.Nil(t, appErr)
+		_, _, appErr = th.App.AddUserToTeam(th.Context, th.BasicTeam.Id, bot.UserId, th.BasicUser2.Id)
+		require.Nil(t, appErr)
+
+		msg := "@" + bot.Username
+		runCmd(msg, "")
+		checkIsMember(th.BasicChannel.Id, bot.UserId)
+	})
+
+	t.Run("try to add bot to a public channel without being a member", func(t *testing.T) {
+		bot, appErr := th.App.CreateBot(th.Context, &model.Bot{Username: "bot_" + model.NewId(), OwnerId: th.BasicUser2.Id})
+		require.Nil(t, appErr)
+		// Do not add to the team
+
+		msg := "@" + bot.Username
+		runCmd(msg, "api.command_invite.user_not_in_team.app_error")
+		checkIsNotMember(th.BasicChannel.Id, bot.UserId)
+	})
+
+	t.Run("try to add bot removed from a team to a public channel", func(t *testing.T) {
+		bot, appErr := th.App.CreateBot(th.Context, &model.Bot{Username: "bot_" + model.NewId(), OwnerId: th.BasicUser2.Id})
+		require.Nil(t, appErr)
+		_, _, appErr = th.App.AddUserToTeam(th.Context, th.BasicTeam.Id, bot.UserId, th.BasicUser2.Id)
+		require.Nil(t, appErr)
+		appErr = th.App.RemoveUserFromTeam(th.Context, th.BasicTeam.Id, bot.UserId, th.BasicUser2.Id)
+		require.Nil(t, appErr)
+
+		msg := "@" + bot.Username
+		runCmd(msg, "api.command_invite.user_not_in_team.app_error")
+		checkIsNotMember(th.BasicChannel.Id, bot.UserId)
+	})
 }
 
 func TestInviteGroup(t *testing.T) {
diff --git a/app/user_test.go b/app/user_test.go
index 086e71e25f..b4a57dd32a 100644
--- a/app/user_test.go
+++ b/app/user_test.go
@@ -121,7 +121,7 @@ func TestAdjustProfileImage(t *testing.T) {
 	assert.True(t, adjusted.Len() > 0)
 	assert.NotEqual(t, testjpg, adjusted)
 
-	// default image should require adjustment
+	// default image should not require adjustment
 	user := th.BasicUser
 	image, err := th.App.GetDefaultProfileImage(user)
 	require.Nil(t, err)
diff --git a/app/users/profile_picture.go b/app/users/profile_picture.go
index 1858140e52..4a9c73f36f 100644
--- a/app/users/profile_picture.go
+++ b/app/users/profile_picture.go
@@ -160,7 +160,10 @@ func createProfileImage(username string, userID string, initialFont string) ([]b
 
 	buf := new(bytes.Buffer)
 
-	if imgErr := png.Encode(buf, dstImg); imgErr != nil {
+	enc := png.Encoder{
+		CompressionLevel: png.BestCompression,
+	}
+	if imgErr := enc.Encode(buf, dstImg); imgErr != nil {
 		return nil, ImageEncodingError
 	}
 
diff --git a/config/client.go b/config/client.go
index e26c2bea40..6ce5433dc1 100644
--- a/config/client.go
+++ b/config/client.go
@@ -196,7 +196,7 @@ func GenerateClientConfig(c *model.Config, telemetryID string, license *model.Li
 			props["DataRetentionBoardsRetentionDays"] = strconv.FormatInt(int64(*c.DataRetentionSettings.BoardsRetentionDays), 10)
 		}
 
-		if *license.Features.SharedChannels {
+		if license.HasSharedChannels() {
 			props["ExperimentalSharedChannels"] = strconv.FormatBool(*c.ExperimentalSettings.EnableSharedChannels)
 			props["ExperimentalRemoteClusterService"] = strconv.FormatBool(c.FeatureFlags.EnableRemoteClusterService && *c.ExperimentalSettings.EnableRemoteClusterService)
 		}
diff --git a/config/client_test.go b/config/client_test.go
index a13b9cea77..9c92cfe329 100644
--- a/config/client_test.go
+++ b/config/client_test.go
@@ -254,6 +254,78 @@ func TestGetClientConfig(t *testing.T) {
 				"EnableCustomGroups": "false",
 			},
 		},
+		{
+			"Shared channels other license",
+			&model.Config{
+				ExperimentalSettings: model.ExperimentalSettings{
+					EnableSharedChannels: model.NewBool(true),
+				},
+			},
+			"",
+			&model.License{
+				Features: &model.Features{
+					SharedChannels: model.NewBool(false),
+				},
+				SkuShortName: "other",
+			},
+			map[string]string{
+				"ExperimentalSharedChannels": "false",
+			},
+		},
+		{
+			"licensed for shared channels",
+			&model.Config{
+				ExperimentalSettings: model.ExperimentalSettings{
+					EnableSharedChannels: model.NewBool(true),
+				},
+			},
+			"",
+			&model.License{
+				Features: &model.Features{
+					SharedChannels: model.NewBool(true),
+				},
+				SkuShortName: "other",
+			},
+			map[string]string{
+				"ExperimentalSharedChannels": "true",
+			},
+		},
+		{
+			"Shared channels professional license",
+			&model.Config{
+				ExperimentalSettings: model.ExperimentalSettings{
+					EnableSharedChannels: model.NewBool(true),
+				},
+			},
+			"",
+			&model.License{
+				Features: &model.Features{
+					SharedChannels: model.NewBool(false),
+				},
+				SkuShortName: model.LicenseShortSkuProfessional,
+			},
+			map[string]string{
+				"ExperimentalSharedChannels": "true",
+			},
+		},
+		{
+			"Shared channels enterprise license",
+			&model.Config{
+				ExperimentalSettings: model.ExperimentalSettings{
+					EnableSharedChannels: model.NewBool(true),
+				},
+			},
+			"",
+			&model.License{
+				Features: &model.Features{
+					SharedChannels: model.NewBool(false),
+				},
+				SkuShortName: model.LicenseShortSkuEnterprise,
+			},
+			map[string]string{
+				"ExperimentalSharedChannels": "true",
+			},
+		},
 	}
 
 	for _, testCase := range testCases {
diff --git a/i18n/en.json b/i18n/en.json
index bf696f48a5..18a5dc0dab 100644
--- a/i18n/en.json
+++ b/i18n/en.json
@@ -900,15 +900,15 @@
   },
   {
     "id": "api.command_invite.hint",
-    "translation": "@[username] ~[channel]"
+    "translation": "@[username]... ~[channel]..."
   },
   {
     "id": "api.command_invite.missing_message.app_error",
-    "translation": "Missing Username and Channel."
+    "translation": "Missing Username and/or Channel."
   },
   {
     "id": "api.command_invite.missing_user.app_error",
-    "translation": "We couldn't find the user. They may have been deactivated by the System Administrator."
+    "translation": "We couldn't find the user {{.User}}. They may have been deactivated by the System Administrator."
   },
   {
     "id": "api.command_invite.name",
@@ -920,7 +920,7 @@
   },
   {
     "id": "api.command_invite.private_channel.app_error",
-    "translation": "Could not find the channel {{.Channel}}. Please use the channel handle to identify channels."
+    "translation": "Could not find the channel {{.Channel}}. Please use the [channel handle](https://docs.mattermost.com/messaging/managing-channels.html#naming-a-channel) to identify channels."
   },
   {
     "id": "api.command_invite.success",
@@ -1719,7 +1719,7 @@
   },
   {
     "id": "api.emoji.create.too_large.app_error",
-    "translation": "Unable to create emoji. Image must be less than 1 MB in size."
+    "translation": "Unable to create emoji. Image must be less than 512 KiB in size."
   },
   {
     "id": "api.emoji.disabled.app_error",
@@ -2055,7 +2055,7 @@
   },
   {
     "id": "api.license.request-trial.can-start-trial.not-allowed",
-    "translation": "This trial license key for Mattermost Enterprise Edition has expired and is no longer valid. If you would like to extend your trial period please [contact our sales team](https://mattermost.com/contact-us/)."
+    "translation": "Failed to apply new trial license. You have previously applied a trial license to this Mattermost instance.. If you would like to extend your trial period please [contact our sales team](https://mattermost.com/contact-us/)."
   },
   {
     "id": "api.license.request_renewal_link.app_error",
diff --git a/i18n/hu.json b/i18n/hu.json
index c010bb1704..dc185e734b 100644
--- a/i18n/hu.json
+++ b/i18n/hu.json
@@ -9362,5 +9362,9 @@
   {
     "id": "model.group.name.reserved_name.app_error",
     "translation": "csoport név létezik mint lefoglalt név"
+  },
+  {
+    "id": "api.acknowledgement.delete.archived_channel.app_error",
+    "translation": "Nem lehet eltávolítani egy archivált csatornában lévő jóváhagyást."
   }
 ]
diff --git a/i18n/ko.json b/i18n/ko.json
index ad4733a1aa..69ea350a1b 100644
--- a/i18n/ko.json
+++ b/i18n/ko.json
@@ -1369,11 +1369,11 @@
   },
   {
     "id": "api.post.send_notification_and_forget.push_comment_on_post",
-    "translation": " 당신의 게시글에 답글이 달렸습니다."
+    "translation": " 당신의 게시글에 댓글이 달렸습니다."
   },
   {
     "id": "api.post.send_notification_and_forget.push_comment_on_thread",
-    "translation": " 당신이 참여한 글타래에 답글이 달렸습니다."
+    "translation": " 당신이 참여한 글타래에 댓글이 달렸습니다."
   },
   {
     "id": "api.post.send_notifications_and_forget.push_explicit_mention",
@@ -4565,7 +4565,7 @@
   },
   {
     "id": "oauth.gitlab.tos.error",
-    "translation": "GitLab's Terms of Service have updated. Please go to gitlab.com to accept them and then try logging into Mattermost again."
+    "translation": "GitLab 서비스 약관이 업데이트되었습니다. {{.URL}}으로 이동하여 수락한 다음 Mattermost에 다시 로그인해주세요."
   },
   {
     "id": "plugin.api.update_user_status.bad_status",
@@ -4741,7 +4741,7 @@
   },
   {
     "id": "web.error.unsupported_browser.min_os_version.mac",
-    "translation": "macOS 10.14 이상"
+    "translation": "macOS 11 버전 이상"
   },
   {
     "id": "web.error.unsupported_browser.min_browser_version.safari",
@@ -4753,11 +4753,11 @@
   },
   {
     "id": "web.error.unsupported_browser.min_browser_version.edge",
-    "translation": "44버전 이상"
+    "translation": "95 버전 이상"
   },
   {
     "id": "web.error.unsupported_browser.min_browser_version.chrome",
-    "translation": "100 버전 이상"
+    "translation": "106 버전 이상"
   },
   {
     "id": "web.error.unsupported_browser.learn_more",
@@ -7241,11 +7241,11 @@
   },
   {
     "id": "api.post.send_notification_and_forget.push_comment_on_crt_thread",
-    "translation": " 지켜보는 중인 글타래에 답글을 남겼습니다."
+    "translation": " 지켜보는 글타래에 댓글을 남겼습니다."
   },
   {
     "id": "api.post.send_notification_and_forget.push_comment_on_crt_thread_dm",
-    "translation": " 글타래에 답글을 남겼습니다."
+    "translation": " 글타래에 댓글을 남겼습니다."
   },
   {
     "id": "api.command_remote.missing_command",
@@ -8034,5 +8034,9 @@
   {
     "id": "app.user.update_threads_read_for_user.app_error",
     "translation": "모든 사용자 글타래들을 읽음 상태로 변경할 수 없습니다"
+  },
+  {
+    "id": "api.admin.syncables_error",
+    "translation": "구성원을 그룹-팀 및 그룹-채널에 추가하지 못했습니다"
   }
 ]
diff --git a/model/license.go b/model/license.go
index b0cb95c809..7c875dad32 100644
--- a/model/license.go
+++ b/model/license.go
@@ -321,6 +321,16 @@ func (l *License) HasEnterpriseMarketplacePlugins() bool {
 		l.SkuShortName == LicenseShortSkuEnterprise
 }
 
+func (l *License) HasSharedChannels() bool {
+	if l == nil {
+		return false
+	}
+
+	return (l.Features != nil && l.Features.SharedChannels != nil && *l.Features.SharedChannels) ||
+		l.SkuShortName == LicenseShortSkuProfessional ||
+		l.SkuShortName == LicenseShortSkuEnterprise
+}
+
 // NewTestLicense returns a license that expires in the future and has the given features.
 func NewTestLicense(features ...string) *License {
 	ret := &License{
diff --git a/model/license_test.go b/model/license_test.go
index 6319ccc8e9..1d1a5f1acf 100644
--- a/model/license_test.go
+++ b/model/license_test.go
@@ -343,3 +343,53 @@ func TestLicense_IsSanctionedTrial(t *testing.T) {
 		assert.True(t, license.IsSanctionedTrial())
 	})
 }
+
+func TestLicenseHasSharedChannels(t *testing.T) {
+
+	testCases := []struct {
+		description   string
+		license       License
+		expectedValue bool
+	}{
+		{
+			"licensed for shared channels",
+			License{
+				Features: &Features{
+					SharedChannels: NewBool(true),
+				},
+				SkuShortName: "other",
+			},
+			true,
+		},
+		{
+			"not licensed for shared channels",
+			License{
+				Features:     &Features{},
+				SkuShortName: "other",
+			},
+			false,
+		},
+		{
+			"professional license for shared channels",
+			License{
+				Features:     &Features{},
+				SkuShortName: LicenseShortSkuProfessional,
+			},
+			true,
+		},
+		{
+			"enterprise license for shared channels",
+			License{
+				Features:     &Features{},
+				SkuShortName: LicenseShortSkuEnterprise,
+			},
+			true,
+		},
+	}
+
+	for _, testCase := range testCases {
+		t.Run(testCase.description, func(t *testing.T) {
+			assert.Equal(t, testCase.expectedValue, testCase.license.HasSharedChannels())
+		})
+	}
+}
diff --git a/tests/10000x1_expected_preview.png b/tests/10000x1_expected_preview.png
index bf2ca9cc21..6c48a52421 100644
Binary files a/tests/10000x1_expected_preview.png and b/tests/10000x1_expected_preview.png differ
diff --git a/tests/10000x1_expected_thumb.png b/tests/10000x1_expected_thumb.png
index a354c41047..93a8cb3667 100644
Binary files a/tests/10000x1_expected_thumb.png and b/tests/10000x1_expected_thumb.png differ
diff --git a/tests/1x10000_expected_preview.png b/tests/1x10000_expected_preview.png
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