How To Find My Assignments Once I Made A Copy

Once you've made a copy of your assignment, its saved automatically in your Google Drive account. 

If you want to go back to a previous spreadsheet/document to continue working on it, you DO NOT need to go back to the module and open up the template again, as it will have you create a new copy of the blank template.

INSTEAD, go to your Google Drive folder and search for the spreadsheet by the title. Open your document and you'll see all your previous work is still there and you can build upon your previous work.