Is anyone able to grade a google assignment created using the Google Assignments LTI and then grade the student’s work on the Canvas app on your iPad?

My iPad is new and up to date. When I go into grade the work, there is a bar that says “launch external tool.”  When I click that bar, the bar moves like it knows I’m pressing it but nothing happens.  I even downloaded the Google Drive and Google Slides (that’s what the assignment was) apps onto my iPad in case that is what it needed.

All videos I see online show grading the assignment on a computer only.