I have students submitting assignments as comments to get around the due date cutoff. They can't submit the assignment because it is closed, so the copy and paste it into the comments. Is there some way to take away that option?
From my research in Canvas Community, there is not a way to do this. I found this topic that might help you.You can tell your students you will not accept any submissions done that way and to always use the Submit Assignment button.
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