Good morning, @kakutzke ...
I do not know of a way to annotate PDFs online prior to your students actually doing the work. I know this probably won't be a great work-around, but the first thing that came to mind was to do all of your annotations "offline". You might even create folders for each of your students on your computer to keep their work organized. You'd have to make a PDF for each student and then send it to them individually via the Canvas Inbox. Again, it is not ideal by any means, but at least this way you are getting these documents to your students before they begin working on the assignment.
I hope this will be of some help to you. Let Community members know if you have any other questions about this...thanks!
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