How to send video from VKontakte API?

Question

API

Guys, there is a bot, VK, I write a video to him, and he sends a video. But how to do it in more detail? And preferably in stages. I am new in this field. links to documentation vkontakte api - you can not throw. I don't understand.
CallBack API
Bot in php language

Answer 1

https://vk.com/dev/messages.send
The attachment parameter accepts a list of attachments (up to 10) separated by a comma.
For example video85635407_165186811
To send a video, you need to know its id (second set of numbers) and the user (community) id (first set of numbers) to which it belongs.