Hello there, @JoeWilmoth ...
Keeping in mind that I have little to no experience with McGraw-Hill Testbuilder, I did a Google search to see if I could come up with any resources for you, and I found the following link:
Adding a McGraw-Hill testbank in Canvas :: eLearning Faculty (bellevuecollege.edu)
The page (from Bellevue College) appears to have been last updated on October 21, 2020. So, the instructions may be close to accurate, but you'll need to try this on your own to see if it meets your needs. I would recommend you reach out to McGraw-Hill if you have other questions or need more up-to-date directions.
Good luck! Keep us posted!
