We had a student whose file quota was massively over limit. Turns out, this long time student had downloaded zip files of all assignment submissions several times over the years using the feature in Account/Settings. Unknown to the student, and not mentioned in the Canvas documentation How do I download assignment submissions from all ... - Instructure Community - 298, each was also saved into the Data Export folder in My Files. Easy to delete but there is no warning the files will be saved there, instead it says you have 30 days to do the download.
My hope is that Instructure will read this message and correct the documentation which only says you have limited time to download the file.
It's very distressing for students to try to embed a picture in a discussion the first week of class only to be told they're over quota, and finding no large media files that can be deleted to make room. Deleting the zip files saved the day but it took us a while to find the source of the problem.