Using Turnitin in Canvas
There are two ways to use Turnitin in Canvas; the first is via an External Tool. Using the external tool option will allow you to use Turnitin’s Grademark to provide comments back to students. The second is via the Plagiarism Framework, which allows you to use Canvas’ SpeedGrader to provide feedback to the students while still accessing their Originality Report. Depending on how you want your assignment setup will determine which you will want to use. The video below walks through adding each type to your course in Canvas.
If you would like the students to submit a draft and a final version, you could set up two separate assignments - one for the draft and one for the final copy. Note that if you choose to save the paper to the repository, the student's next submission will have matching text with the first draft.