At the top and bottom of the assignment page are three buttons. The Cancel button will cancel your work and the Submit button will send your assignment to your instructor for grading. If an instructor can’t see your work, it is often caused by the third button, the Save As Draft button, which will save your assignment but not send it to your instructor.
By clicking the Save As Draft button, your instructor may see that you are working on your assignment, but it may be locked on your instructor’s page. If it’s locked on that page, your instructor will not be able to view your saved files until you submit the assignment.
To fix this: Go back to the assignments page and click the Submit button when you have completed your work in order to actually send it to your instructor.