Hi @siekmang ...
I can see where this would be nice to be able to submit both a Canvas Studio video and a document as part of the same assignment submission. However, I think you may have to tell your students to first submit either the Studio video or the document...and then in a separate submission, submit the other item. As an instructor, you can still see all the submissions for each of your student which are time/date stamped. Check out the section on "Evaluate Multiple Submissions" in this Guide:
How do I view the details of a submission for a st... - Instructure Community (canvaslms.com)
I know this might not be the solution you were looking for, but I hope it helps in some way to answer your question.