I am a new user and I did search posts to answer my question, but was unable to find what I needed.  My apologies in advance if this has already been solved.

So, we are 100 % remote learning, and I have students turn in math assignments via online upload (pics of their work).  I then go through and grade them.  I mark them 'M' to indicate missing, but I accept late work.  When student later submit their work, I don't think I can easily tell that they have turned in their work (I currently go through speed grader, but have to check every 'M' to see if there is now a pic).  Before grading, it lets me know that there is a file to see, but after grading, it doesn't.

I am wondering if there is a way to see that a file has been uploaded even though there is an 'M' for a grade.  The 'M' is less about the grade, and more to communicate that I haven't received their work.

I thank you in advance for your help.