Can students "unsubmit?" (Newbie question)

Some of my students accidentally submitted an assignment before they were finished, and now they say they can’t edit it anymore. Can I send it back to them? Can they do the assignment again? What options do I/they have?

NEVER MIND! I just answered my own question! Students can go to the “submitted” tab and re-open their files there.

Sorry for taking up bandwidth!