mod_assign_get_submission_status returns feedback only when the gradingstatus of the submission is "released". This is good if the web service is called by the student. But the teacher should be able to access the feedback before it is released as it is possible in the web interface.

Or is there any other way to access feedback files as a teacher (grader) before it is released to the student?

This may be similar to MDL-60708 for workshops.

Steps to reproduce:

1. Teacher: Create an assignment with marking workflow
2. Student: Submit the assignment
3. Teacher: Give feedback (comment or file) and set gradingstate to "inmarking" (or any other than "released").
4. Teacher: Feedback is visible in web interface.
5. Teacher: Call mod_assign_get_submission_status with teacher token => no feedback