The first in from the top?

Mark: zero replies.

Yes. It's an American phrase, I suppose, and I would not use it like that.

But yes, in answer to your question.

I'd probably say
1. The document on the top (the first)
2. The second from the top....
and so on.

I like "the document on the top," as fluent as a cool breeze.

Yeah, you could remove "in," and it's really better that way. But most people would just say "second from the top," to begin with, probably. If not, they would probably say "down" from the top, not "in."

Edit: I didn't even scroll down to see that you had already got an answer. This post just suddenly appeared on my screen, for some reason, and I thought it was new.