Hello there, @aalynn...
Sorry to see that your question has been sitting out here unanswered for several months. I don't think that you would want to set your Google Doc document as "editable", because that would allow your students to edit your copy that is on your account. The Google Assignment should create a copy of that document in each of the student's own Google accounts so that they can edit their own copy. So, setting your file as viewing only should be okay, I would think. Here is a Guide with more information for you: How do I create a cloud assignment with a Google D... - Canvas Community.
I hope this will be of some help to you. Sing out if you have any other questions...thanks!
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