There are three ways to score student work in Pivot Interactives:
Multiple-choice questions can be autograded
You can use the Grade by Question function
Use the Grade by Student function
No matter which you use, your grades will be recorded both in Pivot Interactives and in Canvas Gradebook.
Alternatively, you can have students download their work from Pivot Interactives as a PDF and then submit the file as a Canvas assignment. This way you can use the Canvas Speed Grader.