Hi @ScottBurnett ...
Since Turnitin is a 3rd-party external LTI tool, when you use Turnitin in conjunction with your assignment, it will not show the Canvas rubric below it. However, as you've indicated, if you select other options besides the "External Tool" submission type, you can still attach the Canvas rubric to your assignment. Once you have attached the rubric, then you set the assignment back to using the "External Tool" submission type and then select Turnitin. Even though you and your students cannot see the rubric underneath the assignment, there are two places where the rubric can be viewed (one place each for you and your students):
Also, I'm not sure if you know about this, but have you ever used the rubric tool that Turnitin offers? When I was a Canvas administrator at my previous job, I had a chance to try it out a bit (never in a real course, though), and there were a few different options for building rubrics using the Turnitin interface. You could then use that rubric (instead of the Canvas rubric) for grading, and that score would pass back to the Canvas gradebook. Creating rubrics in the Turnitin interface was a little more complicated (IMHO) compared to creating Canvas rubrics, but it seemed to me that the Turnitin interface offered a couple more options for rubrics that wouldn't really work well with Canvas rubrics. So, you might want to check that out some time.
I hope this will help in some way! Take care, and be well.
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