Hey Delanie,
Heather is correct. The text box field in Canvas is a standard HTML text box. This content is not cached, because it is being constantly updated until a submission is made and storing every single keystroke would be a massive amount of memory (also an invasion of privacy that would be blocked by anti-malware software like Windows Defender.)
The undelete option is only available for instructors or admins, because students can't edit a course. The undelete page doesn't recover assignment submissions- rather, it restores pages or assignments that were accidentally deleted.
I'm sorry that there's no way to recover your work! I would suggest Google Docs in future, as that service will save everything you write.
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