To check that your assignment is appearing on the system, click on “Assignments”   button in the menu. Then, from the Inbox select the blue “View” button. This will open your assignment in a new “Document Viewer” format.

If you have been through submission, as outlined in the “How can I prove that I have made a submission?” section,   you ought to have saved the Paper number which appeared on the receipt that appears as a part of the process.  You will absolutely need this number if your case needs to be referred to Turnitin for a search.