There are a couple of ways to view Turnitin submissions in Ultra courses.
1. Click the link to the Turnitin assignment in the course content area:
2. This take you to the Turnitin assignment inbox where you can view all the submissions and similarity reports:
Another way to do it is go to the Gradebook, and the Gradeable Items view. Click the assignment:
This takes you back to that same Turnitin Assignment inbox to view the submissions and similarity reports.
Note: It doesn't work from the Grades view in the Gradebook. Going to the Gradebook and grades, and then clicking to view the submission doesn't currently work: