You have to setup the new Google Assignments LTI to use the originality reports.
Use Assignments LTI with Canvas - Assignments Help
I was in some kind of announcement webinar about it. It's currently free but the plan was to add limits (can only use three times) and then monetize it eventually.
In my experience, the new LTI works way better. It allows teachers and students to send multiple files. It transfers the edit rights of the file to the teacher instead of just sending a PDF copy. We regularly had to fix student accounts by deleting tokens with the old LTI. Haven't had to do that even once with the new one.
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