RE: Connect your Bot to the World - XML, JSON, Web Services, HTML Scraping, Twitter, Facebook, Telegram, Email

You can include a link to a pdf or other file from a response. Responses can include HTML links and other HTML tags.

You can also upload a file to your bot from its Chat page and it will give you the URL to the file.

You can parse a text file from Self using,

Http.requestText(url)