When a student attaches a file to a discussion inside of a course, the attached file will be saved in the users "Files" area. Currently, the users "Files" area quota is set to 106MB.
This brings up the following concerns:
Students are prevented and unable to attach files to discussions if their personal file storage is full.
Courses that may be using discussions for assignment purposes now rely on the users quota - when there are no student quotas in other aspects of Canvas.
Once a student removes items from the "Files" area, they would then also be inaccessible from the discussion. This would make the file inaccessible if it's later needed as part of the students academic record.