Document

The document sends a file to users. It works in Facebook, Telegram, Viber, WhatsApp and VK.
The maximum size of the uploaded file is 5 MB.
The name of the document is displayed below the document itself.
This is what the sent document looks like in Telegram:
There may be a variable in place of the file link. The main condition is that the variable value is a link to the file. This can be either last_request or a document sent by the user.
The link must contain a link to the document, such as this link: http://static.botmother.com/howtos/setnamebotfatherru.pdf.