Address outstanding merging issues with cloud branch (#17160)

model/post.go

@@ -45,7 +45,7 @@ const (
 	POST_EPHEMERAL              = "system_ephemeral"
 	POST_CHANGE_CHANNEL_PRIVACY = "system_change_chan_privacy"
 	POST_ADD_BOT_TEAMS_CHANNELS = "add_bot_teams_channels"
-	POST_FILEIDS_MAX_RUNES      = 150
+	POST_FILEIDS_MAX_RUNES      = 300
 	POST_FILENAMES_MAX_RUNES    = 4000
 	POST_HASHTAGS_MAX_RUNES     = 1000
 	POST_MESSAGE_MAX_RUNES_V1   = 4000