Right now, we cannot add a Rubric to an External Tool Assignment (i.e. Google Cloud Assignment, Google LTI Assignment, or Turnitin.com) after it has been assigned. If students have already submitted, and I have not remembered to add a rubric, then I'm done for. I can't go back and "undo" and "redo" that feature just to add a rubric. Since rubrics are connected to Speed Grader, which is a Canvas feature and not an external tool itself, so I think we should be able to add a rubric after the fact. 🙂

Thanks!