What should I do if I received an email to resubmit my assignment with the additional gifs (although these additional gifs are already included in my submission within the deadline) and I received an error message when I try to resubmit it?

You can always update your submission at any time before the deadline in case you want to re-upload the GIF. You can check out Submitting Assignments tab for detailed instructions in the course portal.

If the error message persists (Technical questions), you can do either of the following:

Option 1: Post it on the help channel of your course.

Option 2: Peach out directly to your assigned tech fellow or course coordinator.