I'm on long term thru my employers company, since august.
They want everything.
I'd suggest asking them what forms need to be filled out and have them Mail you a copy and fax a copy to every Dr you are seeing.
Also advise all of your Dr's yo fax your full file to them.
Even if it's 1000 pages.

That's what I do everything they ask for more info, and I've never had a problem.

I'm surprised they haven't denied you yet, which is good so you don't have to appeal.

Good luck!