Hello there, @GersonBronstein …
As far as I know, there is no option in Classic Quizzes or New Quizzes within Canvas that would allow students to take quizzes in an offline setting and then upload those answers back to Canvas.
You mention “connection downtimes”. This could be related to any number of things…including a student’s own internet connection. For example, if someone’s ISP (Internet Service Provider) is having issues, then that’s on the ISP and not Canvas. You can always go to http://status.instructure.com to see if Canvas is online or not. And, you should be able to subscribe via RSS feed if you want: Canvas Status via RSS Feed.
I would also recommend that students report issues like this to the Canvas Help Desk staff. That way, if there is an issue on the Canvas side, their technicians can look into it further and hopefully provide a solution.
I hope this will be of some help to you. Sing out if you have any other questions about this…thanks!
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