@daniel_wang ...
I am sorry that nobody has responded to you until now, and I'm also sorry to read that you lost some work that you had typed into Canvas. I'm not sure if you are a student or an instructor, but I'm not sure I have great news for you. My guess is that the content you were typing (as a content page for your students to view or as something you were submitting as a student) is probably lost. One thing that people sometimes recommend is, if you have a lot to type out, to first put all your text in a file such as a Word document. Save that document to your computer, and then copy/paste the text into Canvas. Yes, it's a bit of extra work on your end, but this ensures that you will not lose your work.
I know this might not be the exact answer you were hoping for, but I hope that it will help to answer your question in some way. Take care, stay safe, and be well.
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