We discovered that if the assignment was originally in a Word Format and the teacher had not saved as a Google Doc so the file was a .docx, then the students were not able to submit the assignment using any of the submission types. We are also having challenges with students uploading other file types if they are saved in their Google Drive. The process for submitting assignments has become cumbersome for our students and the problem is not always consistent. We figure out a process, communicate with students, and then it changes a few weeks later.
We also noticed that the Immersive Reader feature will not show up on assignments if the Assignment Enhancement feature is enabled, but when it is disabled it will show up on the page.