Thanks so much for the reply! I was thinking that would have been the case, but I didn't think to take a screenshot or have any other sort of record at the time. It's been over a month, and I don't recall what kind of message I received. If I may make a suggestion, it would be nice to have somewhere a person could just verify that a submission was successful.
At this point I don't know whether my submission was successful, or not so I don't know if I should re-submit. I know I shouldn't re-submit if it was successful, but if it wasn't I have no way of knowing and I could just end up waiting two years (as I've seen referenced in these forums). Seems there should be a better way.