In case others find this, the following looks promising as a solution to this request: Matlab Grader & LMS Viewing Student Solutions - MATLAB Answers - MATLAB Central

The issue arises when we copy into the same course. If we copy between courses, the issue doesn't arise. So we may have to copy out and then copy back in. 

If I want to delete unused files, to tidy up, how do I ensure that I am not taking out files that are in use? This seems like a solution. Possibly this is covered in Andrea Adimando's observations...

Yes, this would be a good idea. We use a rubric for the Essay questions, but it's too easy for someone to add marks to the rubric but forget to carry them over to the Quiz, it's an additional ...

I think the key question is whether you are using a Question Group, or not? If not, you must be copying the questions when you use them in a Quiz? The copies then will still be wrong, even if the orig...

In case others find this, the following looks promising as a solution to this request: Matlab Grader & LMS Viewing Student Solutions - MATLAB Answers - MATLAB Central

The issue arises when we copy into the same course. If we copy between courses, the issue doesn't arise. So we may have to copy out and then copy back in. 

If I want to delete unused files, to tidy up, how do I ensure that I am not taking out files that are in use? This seems like a solution. Possibly this is covered in Andrea Adimando's observations...

Yes, this would be a good idea. We use a rubric for the Essay questions, but it's too easy for someone to add marks to the rubric but forget to carry them over to the Quiz, it's an additional ...

I think the key question is whether you are using a Question Group, or not? If not, you must be copying the questions when you use them in a Quiz? The copies then will still be wrong, even if the orig...