Note : It's helpful to use slow 3G mode in developer tools to throttling your connection. Issue 1: Start writing a new forum discussion and add something to all required fields. Drag-and-drop the first image into atto (it's helpful to use slow 3G mode in developer tools to throttling your connection.) When the first image is uploading, drag-and-drop the second image into atto. Observe the "Post to forum" button. The "Post to forum" button should be disabled until both two files are uploaded Issue 2: Start writing a new forum discussion and add something to all required form fields. Drag-and-drop the first image into atto. When the first image is uploading, drag-and-drop a file into the attachment field. Observe the "Post to forum" button. The "Post to forum" button should be disabled until both two files are uploaded Issue 3: Start writing a new forum discussion and add something to all required form fields. Drag-and-drop the first file which into attachment field. When the first file is uploading, drag-and-drop a second file into the attachment field. Observe the "Post to forum" button. The "Post to forum" button should be disabled until both two files are uploaded Issue 4: Log in as admin in the course, create the essay question which can attachment file. Select preview the question. Open your browser's dev tools and in the network tab (chrome and firefox have this), you'll see a 'throttling' menu item near the right side. Set this to '3G' or the like, preferable as slow as you can set it. Now, drag a 1MB image file (or thereabouts in size) from your local to the attachment area. Verify that the  Save  and the  Submit and finish  button is disabled. Issue 5: Start writing a new forum discussion and add something to all required fields. Drag-and-drop the first file into the attachment area (it's helpful to use slow 3G mode in developer tools to throttling your connection.) Drag-and-drop the same file twice to the file manager. Select 'overwrite'. Observe the "Post to forum" button. The "Post to forum" button should be disabled until the file is overloaded. Issue 6: Start writing a new forum discussion with maximum file size upload is 500KB. Drag-and-drop the file with file size is larger than 500KB into the attachment area. The popup announcement file size is too large. Press "OK" button on the popup. Observe the "Post to forum" button. The "Post to forum" button should be enabled.