So, you just deleted something from your course in Canvas. And you didn’t mean to. Or, maybe, months ago, you deleted something and now you wish you hadn’t.
No worries.
Point your browser at your course home page. Then add the word undelete to the end of the URL and hit Enter, so that you’re at a page with a url like:
https://stmarksschool.instructure.com/courses/1234/undelete
You should see a list of everything you’ve ever deleted from the course. Follow your nose to get what you need back!