Hello there, @keathlm ...
Assuming that your course assignments in Canvas are set up correctly, when your students attach files to those assignments to be submitted to you, they should not count against the student's Files quota. This is documented in the following Guide: How do I view my user files as a student? - Canvas Community. The "View User Files" section confirms this, and the "View My Files" section shows where the "Submissions" folder is where those file submissions should be automatically stored when a student submits an assignment to you in your course. It would be interesting to know if any of those files are being stored outside of the "Submissions" folder...as that's the only place I could think of where the quota would count against a student's account.
Keep us posted...thanks! Take care, and be well.
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