Instructors can access the your previous submissions at any time in the submission history. If you've already uploaded a file and a submission needs to be deleted, we recommend:
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Reaching out to your instructor and asking them to delete a submission for you.
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Resubmitting to your assignment before the due date, and it will override your previous submission. For a programming assignment, note that if your instructor has set a limit on the number of submissions allowed, you cannot resubmit past that limit.