Depending on assignment settings, students may have unlimited or limited submission attempts. Instructors can allow or prevent resubmissions for online assignments in assignment settings.
In addition, the availability date can be set for each assignment to restrict dates for submissions.
Student View for Resubmit Assignment
Students will see a Re-submit Assignment link in the Sidebar below the Assignment submission details.
View Assignments in SpeedGrader
Open the student's Assignment in SpeedGrader. When a student has submitted multiple submissions, you can view them by clicking the drop-down button.
Viewing Older Submissions
If you view an older submission, Canvas will warn you that the submission you are viewing is not the most recent version.
Set Assignment Availability Dates
If you want to keep students from resubmitting assignments after a certain date, you can change the Assignment availability dates. Next to the date you want to change, choose the Calendar icon.
Set the date and time the assignment availability date by selecting a date  and time . Click the Done button .