When students submit the wrong file or you have simply approved another chance for them to submit an assignment, you might want to delete their old submission instead of adding an extra attempt or accommodation. To do so, follow these steps:
Step 1
First, go to the Gradebook tab and select the assignment from which you want to delete a submission.
Step 2
Under the Submissions tab, select the student who needs the submission deleted.
Step 3
Once redirected to the submission page, click on the three dots at the top right corner and select Delete attempt.
The student should now be able to make a new attempt without adding an extra attempt or making accommodations.