Annotations on worksheets are sometimes not saved

We have been working on this issue for a few weeks, and expect that it should not happen again.

I created this question as a reference and as a place to leave comments or upvote if you do see it again. Please be as detailed as possible in your report if you see it again.

We were having this issue again today at the end of the day. Students' iPads showed submitted in Mark Durfee's class for a worksheet assignment. However, on his end they did not show submitted (one girl did, the rest did not). Then, when I logged in as the students on my computer, I did not see submitted work. It is all but one student and she had the same problem with Wednesday's assignment.

Lori - I'm going to split off the "Submitted but not submitted for teacher" into a new page from the "Annotations not saving after submission" so that we can track them separately.

Okay, I had another student yesterday whose annotations did not show on the worksheet. I had a teacher email me that her students showed that they submitted blank worksheets, but when she opened the submitted worksheet, the annotations were there. It seems to be a weird sporadic issue.