By default, Assignments are set to only allow one attempt per student. In some cases, you may need to clear a student's attempt or allow a student to submit an additional attempt.
To clear a student's submission attempt or allow for an additional attempt, go to the Grade Center.
Locate your student's submission in the Grade Center spreadsheet.
Hover your mouse over the submission until the chevron appears.
Click the chevron to open a menu. Select View Grade Details.
This will bring you into the submission details. To clear the student's attempt, select Clear Attempt. This will delete the submission from the system. If you would like to allow the student to try uploading the assignment again, select Allow Additional Attempt. This will allow the student to submit the paper again.
For more information on Assignments, see: