If your instructor allows file uploads as a submission type, you can upload a file from your computer as an assignment submission. This lesson shows how to turn in a standard online assignment in a course using Assignment Enhancements.

Any attachments added as part of a graded assignment submission are also copied to your user files but are not counted against your user quota. However, once the file has been uploaded as a submission, you cannot delete the file. Files are stored in the Submissions folder.

If your institution has enabled Google Docs as a submission type, you can also upload a file from Google Drive.

Notes:

• If the assignment you are accessing displays differently, Assignment Enhancements may not be enabled in your course or your instructor may not have used a supported assignment type. Please view this guide for more information.
• Assignment Enhancements does not support the following assignment types: No Submission, Group Assignments, Peer Reviews, and Cloud Assignments.
• Not all file types may be available for your assignment, depending on the assignment submission type set by your instructor.
• Not all of your assignments may be submitted online. If you cannot see options to submit your work, your instructor may want you to submit your assignment in a different way or the assignment is not within its availability dates. View the assignment header and details for instructions, or contact your instructor for assistance.
• Canvas will not accept file uploads larger than 500 MB.

Canvas tutorial below:

https://community.canvaslms.com/t5/Student-Guide/How-do-I-upload-a-file-as-an-assignment-submission-for-a-course/ta-p/416664