Updated error message for invalid attachments (#24872)

webapp/channels/src/components/file_upload/file_upload.tsx

@@ -360,7 +360,7 @@ export class FileUpload extends PureComponent<Props, State> {
         }
 
         if (files.length === 0) {
-            this.props.onUploadError(localizeMessage('file_upload.drag_folder', 'Folders cannot be uploaded. Please drag all files separately.'));
+            this.props.onUploadError(localizeMessage('file_upload.drag_folder', 'This attachment cannot be uploaded.'));
             return;
         }
 

webapp/channels/src/i18n/en.json

@@ -3486,7 +3486,7 @@
   "file_search_result_item.more_actions": "More Actions",
   "file_search_result_item.open_in_channel": "Open in channel",
   "file_upload.disabled": "File attachments are disabled.",
-  "file_upload.drag_folder": "Folders cannot be uploaded. Please drag all files separately.",
+  "file_upload.drag_folder": "This attachment cannot be uploaded.",
   "file_upload.fileAbove": "File above {max}MB could not be uploaded: {filename}",
   "file_upload.filesAbove": "Files above {max}MB could not be uploaded: {filenames}",
   "file_upload.generic_error": "There was a problem uploading your files.",

webapp/channels/src/i18n/en_AU.json

@@ -3490,7 +3490,7 @@
   "file_search_result_item.more_actions": "More Actions",
   "file_search_result_item.open_in_channel": "Open in channel",
   "file_upload.disabled": "File attachments are disabled.",
-  "file_upload.drag_folder": "Folders cannot be uploaded. Please drag all files separately.",
+  "file_upload.drag_folder": "This attachment cannot be uploaded.",
   "file_upload.fileAbove": "File above {max}MB cannot be uploaded: {filename}",
   "file_upload.filesAbove": "Files above {max}MB cannot be uploaded: {filenames}",
   "file_upload.generic_error": "There was a problem uploading your files.",