Hello,

If you have more than 50MB of files stored in "My User Files", I don't think you can upload any more.
How about using links to files uploaded to Google Drive or OneDrive?

Could you check the following URL.

- How do I view my user files?
https://community.canvaslms.com/t5/Canvas-Basics-Guide/How-do-I-view-my-user-files/ta-p/617227

I hope this helps.