diff --git a/webapp/channels/src/components/advanced_text_editor/advanced_text_editor.tsx b/webapp/channels/src/components/advanced_text_editor/advanced_text_editor.tsx
index 6c3979c321..fb042d5149 100644
--- a/webapp/channels/src/components/advanced_text_editor/advanced_text_editor.tsx
+++ b/webapp/channels/src/components/advanced_text_editor/advanced_text_editor.tsx
@@ -108,7 +108,10 @@ const AdvancedTextEditor = ({
     const isRHS = Boolean(postId && !isThreadView);
 
     const currentUserId = useSelector(getCurrentUserId);
-    const channelDisplayName = useSelector((state: GlobalState) => getChannelSelector(state, channelId)?.display_name || '');
+    const channel = useSelector((state: GlobalState) => getChannelSelector(state, channelId));
+    const channelDisplayName = channel?.display_name || '';
+    const channelType = channel?.type || '';
+    const isChannelShared = channel?.shared;
     const draftFromStore = useSelector((state: GlobalState) => getDraftSelector(state, channelId, postId));
     const badConnection = useSelector((state: GlobalState) => connectionErrorCount(state) > 1);
     const maxPostSize = useSelector((state: GlobalState) => parseInt(getConfig(state).MaxPostSize || '', 10) || Constants.DEFAULT_CHARACTER_LIMIT);
@@ -165,6 +168,8 @@ const AdvancedTextEditor = ({
 
     const readOnlyChannel = !canPost;
     const hasDraftMessage = Boolean(draft.message);
+    const isDMOrGMRemote = isChannelShared && (channelType === Constants.DM_CHANNEL || channelType === Constants.GM_CHANNEL);
+    const isDisabled = Boolean(readOnlyChannel || isDMOrGMRemote);
 
     const handleShowPreview = useCallback(() => {
         setShowPreview((prev) => !prev);
@@ -241,12 +246,12 @@ const AdvancedTextEditor = ({
     useOrientationHandler(textboxRef, postId);
     const pluginItems = usePluginItems(draft, textboxRef, handleDraftChange);
     const focusTextbox = useTextboxFocus(textboxRef, channelId, isRHS, canPost);
-    const [attachmentPreview, fileUploadJSX] = useUploadFiles(draft, postId, channelId, isThreadView, storedDrafts, readOnlyChannel, textboxRef, handleDraftChange, focusTextbox, setServerError);
+    const [attachmentPreview, fileUploadJSX] = useUploadFiles(draft, postId, channelId, isThreadView, storedDrafts, isDisabled, textboxRef, handleDraftChange, focusTextbox, setServerError);
     const {
         emojiPicker,
         enableEmojiPicker,
         toggleEmojiPicker,
-    } = useEmojiPicker(readOnlyChannel, draft, caretPosition, setCaretPosition, handleDraftChange, showPreview, focusTextbox);
+    } = useEmojiPicker(isDisabled, draft, caretPosition, setCaretPosition, handleDraftChange, showPreview, focusTextbox);
     const {
         labels,
         additionalControl: priorityAdditionalControl,
@@ -446,7 +451,7 @@ const AdvancedTextEditor = ({
         };
     }, [channelId, postId]);
 
-    const disableSendButton = Boolean(readOnlyChannel || (!draft.message.trim().length && !draft.fileInfos.length)) || !isValidPersistentNotifications;
+    const disableSendButton = Boolean(isDisabled || (!draft.message.trim().length && !draft.fileInfos.length)) || !isValidPersistentNotifications;
     const sendButton = readOnlyChannel ? null : (
         <SendButton
             disabled={disableSendButton}
@@ -464,7 +469,7 @@ const AdvancedTextEditor = ({
     let createMessage;
     if (placeholder) {
         createMessage = placeholder;
-    } else if (!postId && !readOnlyChannel) {
+    } else if (!postId && !isDisabled) {
         createMessage = formatMessage(
             {
                 id: 'create_post.write',
@@ -479,11 +484,18 @@ const AdvancedTextEditor = ({
                 defaultMessage: 'This channel is read-only. Only members with permission can post here.',
             },
         );
+    } else if (isDMOrGMRemote) {
+        createMessage = formatMessage(
+            {
+                id: 'create_post.dm_or_gm_remote',
+                defaultMessage: 'Direct Messagess and Group Messages with remote users are not supported.',
+            },
+        );
     } else {
         createMessage = formatMessage({id: 'create_comment.addComment', defaultMessage: 'Reply to this thread...'});
     }
 
-    const messageValue = readOnlyChannel ? '' : draft.message;
+    const messageValue = isDisabled ? '' : draft.message;
 
     let textboxId = 'textbox';
 
@@ -499,7 +511,7 @@ const AdvancedTextEditor = ({
         break;
     }
 
-    const showFormattingBar = !isFormattingBarHidden && !readOnlyChannel;
+    const showFormattingBar = !isFormattingBarHidden && !isDisabled;
 
     const wasNotifiedOfLogIn = LocalStorageStore.getWasNotifiedOfLogIn();
 
@@ -589,7 +601,7 @@ const AdvancedTextEditor = ({
                 )}
                 <div
                     className={'AdvancedTextEditor__body'}
-                    disabled={readOnlyChannel}
+                    disabled={isDisabled}
                 >
                     <div
                         ref={editorBodyRef}
@@ -620,7 +632,7 @@ const AdvancedTextEditor = ({
                             channelId={channelId}
                             id={textboxId}
                             ref={textboxRef!}
-                            disabled={readOnlyChannel}
+                            disabled={isDisabled}
                             characterLimit={maxPostSize}
                             preview={showPreview}
                             badConnection={badConnection}
@@ -629,7 +641,7 @@ const AdvancedTextEditor = ({
                             onWidthChange={handleWidthChange}
                         />
                         {attachmentPreview}
-                        {!readOnlyChannel && (showFormattingBar || showPreview) && (
+                        {!isDisabled && (showFormattingBar || showPreview) && (
                             <TexteditorActions
                                 placement='top'
                                 isScrollbarRendered={renderScrollbar}
@@ -642,7 +654,7 @@ const AdvancedTextEditor = ({
                                 {formattingBar}
                             </FormattingBarSpacer>
                         ) : formattingBar}
-                        {!readOnlyChannel && (
+                        {!isDisabled && (
                             <TexteditorActions
                                 ref={editorActionsRef}
                                 placement='bottom'
diff --git a/webapp/channels/src/components/advanced_text_editor/use_emoji_picker.tsx b/webapp/channels/src/components/advanced_text_editor/use_emoji_picker.tsx
index faa17ee8ca..a6494a6c9f 100644
--- a/webapp/channels/src/components/advanced_text_editor/use_emoji_picker.tsx
+++ b/webapp/channels/src/components/advanced_text_editor/use_emoji_picker.tsx
@@ -25,7 +25,7 @@ import type {PostDraft} from 'types/store/draft';
 import {IconContainer} from './formatting_bar/formatting_icon';
 
 const useEmojiPicker = (
-    readOnlyChannel: boolean,
+    isDisabled: boolean,
     draft: PostDraft,
     caretPosition: number,
     setCaretPosition: (pos: number) => void,
@@ -116,7 +116,7 @@ const useEmojiPicker = (
 
     let emojiPicker = null;
 
-    if (enableEmojiPicker && !readOnlyChannel) {
+    if (enableEmojiPicker && !isDisabled) {
         emojiPicker = (
             <>
                 <EmojiPickerOverlay
diff --git a/webapp/channels/src/components/advanced_text_editor/use_upload_files.tsx b/webapp/channels/src/components/advanced_text_editor/use_upload_files.tsx
index 83542aa5ed..2aa139b50e 100644
--- a/webapp/channels/src/components/advanced_text_editor/use_upload_files.tsx
+++ b/webapp/channels/src/components/advanced_text_editor/use_upload_files.tsx
@@ -29,7 +29,7 @@ const useUploadFiles = (
     channelId: string,
     isThreadView: boolean,
     storedDrafts: React.MutableRefObject<Record<string, PostDraft | undefined>>,
-    readOnlyChannel: boolean,
+    isDisabled: boolean,
     textboxRef: React.RefObject<TextboxClass>,
     handleDraftChange: (draft: PostDraft, options?: {instant?: boolean; show?: boolean}) => void,
     focusTextbox: (forceFocust?: boolean) => void,
@@ -141,7 +141,7 @@ const useUploadFiles = (
     }, [draft, fileUploadRef, handleDraftChange, handleUploadError, handleFileUploadChange]);
 
     let attachmentPreview = null;
-    if (!readOnlyChannel && (draft.fileInfos.length > 0 || draft.uploadsInProgress.length > 0)) {
+    if (!isDisabled && (draft.fileInfos.length > 0 || draft.uploadsInProgress.length > 0)) {
         attachmentPreview = (
             <FilePreview
                 fileInfos={draft.fileInfos}
@@ -157,7 +157,7 @@ const useUploadFiles = (
         postType = isThreadView ? 'thread' : 'comment';
     }
 
-    const fileUploadJSX = readOnlyChannel ? null : (
+    const fileUploadJSX = isDisabled ? null : (
         <FileUpload
             ref={fileUploadRef}
             fileCount={getFileCount(draft)}
diff --git a/webapp/channels/src/i18n/en.json b/webapp/channels/src/i18n/en.json
index 369e491ca4..4d59e468a3 100644
--- a/webapp/channels/src/i18n/en.json
+++ b/webapp/channels/src/i18n/en.json
@@ -3433,6 +3433,7 @@
   "create_group_memberships_modal.create": "Yes",
   "create_group_memberships_modal.desc": "You're about to add or re-add {username} to teams and channels based on their LDAP group membership. You can revert this change at any time.",
   "create_group_memberships_modal.title": "Re-add {username} to teams and channels",
+  "create_post.dm_or_gm_remote": "Direct Messagess and Group Messages with remote users are not supported.",
   "create_post.error_message": "Your message is too long. Character count: {length}/{limit}",
   "create_post.file_limit_sticky_banner.admin_message": "New uploads will automatically archive older files. To view them again, you can delete older files or <a>upgrade to a paid plan.</a>",
   "create_post.file_limit_sticky_banner.messageTitle": "Your free plan is limited to {storageGB} of files.",