Tim Hunt

If you are trying to investigate a problem, and all you are seeing is blank pages, then the first thing to do is to turn on Debugging so instead you see error messages. Then you have a much better chance to work out what the problems are.

Sure.

Sorry I did not have time to give a complete answer. I was only able to give some info.

However, for what I can see, it looks like Moodle is designed so this should be possible. And, proving it works as admin is a worthwhile step on the way to working this out. If you can do it as admin, then doing it as teacher should just be a matter of working out the right permissions (which is where your question started).

The code just checks mod/assign:submit, and when I am logged in as admin, I see the 'Submit for grading' action in hthe Edit menu in the grading table.

This action only apears if the student's attempt is currently in draft state.

They are a probably a bad idea.

That is in my opinion, but it was an opinion formed in part based on things like this excellent Moodle developer meeting: https://moodledev.io/general/community/meetings/2020/06

I think the bug you are trying to report is:

'Quiz auto-save does not notice when "Clear my choice" is clicked, so the changed response is not saved until some other action is performed.'