> the students themselves don't have the artifacts to resubmit via email because they were done in Canvas
It’s so simple to send an e-mail to the student with relevant records on completion of a quiz or whatnot. They don’t do it, because they want to control the data. (And universities don’t insist on it for who knows what reason.)
Students having records of what their score was doesn't prove to the professor / university what score they received. "FWD: Exam 1 Results" is not especially auditable.
Makes me glad I've always avoided doing my work on web platforms. When we used to have to make presentations in Google Slides I used to do them in Org-mode, then export to Sheets. I still have all those assignments sitting on my disk. Sure, there's versions of them on Google Drive, but I always make sure that the canonical version is the one on my disk.
>It’s so simple to send an e-mail to the student ...
What seems easy on hobby projects gets way more difficult at scale. Source: experience.
I've never used Canvas before, but all the LMSes that I've used allow students to enable emails whenever anything is updated, including when grades are posted. This is off by default because it's often 10+ emails a day, because many teachers post notes once a day, and with 5 classes, that adds up pretty quick. I personally have it enabled because it's pretty manageable with some custom Outlook rules, but setting this up is well beyond the capabilities of most students.