Resubmit an Assignment
If an instructor has permitted resubmissions to an assignment, students will be able to resubmit via the assignment's textbox or as a freshly uploaded document.
Resubmit an attached document
Visit the Assignments tool
Select the Assignments tool from the Tools Menu in your site.
Click on the title of the assignment
Remove your previously submitted document
Use the Remove option to delete your previously submitted document.
Attach your new document
Click Choose File to select a new document from your computer.
After uploading your new document, it will display in the Attachments area.