Hello there, @ChinonyeremAlag ...
I wonder if your instructor may have put some kind of restriction on the types of files that you can submit to that particular assignment. For example, when you are viewing your assignment details, do you see an area for "File Types" that lists possible types of files that can be submitted? Here's a screenshot from my own sandbox course:
As you can see from this example, only three file types are allowed. Might your instructor have set up something similar to this? You might want to check with your instructor to let him/her know you are having difficulties. And, do you know if others in your course have been able to successfully submit their assignment? Or, are they having difficulties as well?
Here's a Guide on how to contact your instructor directly in Canvas:
Please keep us posted here in the Community...thanks!
