Hi @JimKerns,

Generally Canvas is designed to keep almost all data around, which can be good for reporting and other things, but bad for a situation like this.  The student can usually just resubmit a new attempt with the right work to fix up most things.  If they submitted a doc with confidential info, your school's admin team may be able to delete the file from the original submission (but the submission record itself would remain).

-Chris