Other LMS's, such as Google Classroom have the ability to go to an assignment, and view a preview page of all student submissions at once. This way you can ensure that all students handed something in, and it isn't blank, in one quick glance. (Or easily see which students didn't submit or submitted a blank attachment).

I have attached a screen shot of what this looks like in Google Classroom as an example. We do have the dropbox/annotate preview, so I was wondering if something like this would be possible just on a scale of the entire class.

student work Go...

Attachments Open full size