When students chose to use the Test Submission/Write Submission feature of an assignment, instructors should be able to add comments to the attempt.
I agree that this is critical to grading assignments. Some instructors prefer students to use the Write Submission box instead of attaching a document. It is vital that Box be able to annotate on these types of submissions.
Our institution is also running into this issue - students will type up their assignment submissions on Blackboard and then there is no way for the instructor to submit in-line comments as feedback - Unless they paste the text into a word doc and mark it up, then attach a file to the feedback. Some of our instructors would not be able to manage that very easily.
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