A CPA is requesting my"latest tax filing". What does that mean? What should I send?

based on the version you are using, you did not pay for live support.  anyway if you did the CPA or EA would have access to your return and would not need for you to send them a copy.  this sounds like a scam, but we can't see the letter, Ignore it.

It's not a scam, I need the information. I'm simply trying to find out what "tax filing" means. turns out, it's my 1040.