When users upload files via the ‘File Upload’ question type, Admin is provided links to download those files. However, the links generated frequently or nearly always contain spaces in them.
In my case, 40-50 students taking an online exam (created with the QSM premium bundle) uploaded MS Word documents which typically could not be accessed by the links received by Admin because the links contained spaces in them.
The files also do not appear in the Media tab. The only way to download these files appears to be, therefore, by browsing the /wp-content/uploads/ directory in the browser’s address bar.
Proposed solution = QSM plugin to remove all spaces from files uploaded by users.