Python bot - how to parse file garbage?

Question

Python

There is a Python bot, the main purpose of which is to provide any information at the request of the user.
The question is just how to provide the user with a document on request?
It is a document in DOC, PDF and EXEL format.

For example, I have a contract form, the user clicks on the desired button for this contract, then the bot uploads this document to him - how to do this? What libraries or methods..

Ps
I thought to make file garbage in the telegram (chat with the bot and with me) and parse from this chat - but again, I can’t find how to do this in the vastness of Google.