I use the free Canvas option to teach my classes. I have started running into issues where students can't upload their projects, and after advising them to make sure the file size is not too big, some are still running into this issue. They say they are given the message that their "Data allotment" is full, or something along those lines. They said that all the classes they've ever taken on Canvas are still available, and these are eating up space. What solutions might there be?