This is a re-creation of Paul Rettey's original idea: Display file upload progress bar for students uploading assignment submissions, which was archived. I believe this is an important UI/UX consideration.
From here on is the text/images copied directly from the original idea...
At the moment when a student submits a file for an assignment there is no file upload progress displayed, instead students see the button 'Submitting...'
If a student is submitting a media file that is quite large it would be very useful to the student to see a file upload progression bar. This will tell the student the file is being uploaded or if the upload has stalled.
Something like this would be useful:
Perhaps with numerical feedback indicating speed of upload / amount uploaded / amount remaining.