1. When submitting or accessing Google Drive files, make sure you're logged in to your student email account and no other Gmail account. (Click HERE to learn how to sign out of other accounts.)

2. After clicking, “submit assignment”, select the Google Drive LTI 1.3 option (see image below).  This opens a window to your Drive and allows you to select a file to submit.  Note: The first time you access your Google Drive you will need to authorize access (possibly several times).  

3. Don’t forget to click the Submit Assignment button in Canvas after selecting the file from Google Drive.