I would not say "here" and I would say either: Attached is the document... or I am attaching the document... or The document is attached --- for an e-mail and
Enclosed is ... or I am enclosing.... for a letter.
You don't enclose a document in an e-mail.
A month ago, we were working on a job application and we were taught to write 'I've enclosed'. At least that's how it said in a sample Job App. in my textbook. I've enclosed a copy of my CV...