I need to file a paper return to Quebec for taxes in 2018 because I am a non-resident. But Turbotax has only given me a Federal return I also need the Provincial one.

On the page “Where did you live at the end of the year?” answer Quebec. Then on the next page “Did your Canadian residency change in 2018?”, answer YES, and fill in the information that is relevant to your situation. You should now have access to the Quebec portion of the interview, which can be found under “Provincial” in the left side menu once you have completed the “My Info” part of the interview.