Can I grade my quizzes offline?
Sure! You can do anything you want in Canvas offline; however, nothing you do offline will count nor update when you are back online.
Sorry, I just could not resist that wonderful opening you gave me. But my answer was still accurate - no you cannot work offline in Canvas.
There is a feature idea currently open for voting that you might want to review and support at Offline Grading in Speedgrader
I hope this is helpful,
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