Yes, the Import function for exams can be VERY destructive. Due to the campus lockdown and loss of some class sessions last spring, I gave a final that combined what is normally two separate exams. This semester, I separated them again, and created Exam 3 by importing last semester's final and editing it. The students took the exam, everything was fine. UNTIL I imported the final exam again, to now create the Exam 4. With no warning, Canvas combined the final with Exam 3 that students had already taken. It didn't add the new exam neatly at the end, either. It was a huge mess, with all the questions mixed up with no rhyme or reason. It took forever to undo the godawful mess. It's unconscionable that they allow this to happen.
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I'm one of those new teachers reluctantly teaching everything remotely on Canvas. I had been using Canvas for sharing course documents with students for years, though, and had received instructions on how to copy a Canvas course from one semester to another. There was nothing in the instructions telling me that I cannot copy exams, but this was a non-issue until now, because I never gave online exams. Long story short, I spent the better of a day yesterday undoing the mess I inadvertently created in an exam that students had already taken, when I uploaded the same exam twice. Why there is no warning, as Nancy has suggested above, is beyond me. Heck, a warning shows up anytime we even try to make minor edits to a homework assignment if students have already submitted them. But Canvas will overwrite an exam that students have already taken, even if the exam has a different name? It's nuts.
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