I can tell if a student has turned something in the first time because it comes up under my "not graded list." However, if a student resubmits something for more credit, I have no way of easily knowing it is there unless the student sends me a message. Here are a couple of ideas for setting it up so that the teacher knows when another revision is submitted:
An option for only receiving an email if a student submits a new revision.
A option for student to check when they add a new submission indicating they need this assignment re-graded. Then it will come up in the "items to grade" area.
Thanks for considering these ideas!