Sending a file

Hi all,
I have installed jitsi meet on my machine and I want to add a sending file button in the chat section to allow the user to send a file to other users in the room and other users can download this file. Is there is a way to help me to achieve that?

Thanks in advance.

You need first to think of a service that will do the file transfer. Or check what does xmpp multiuser chat offer about file transfer and is that supported by prosody.
When you have a plan you can start with building and running jitsi-meet and exploring the code about the chat: https://github.com/jitsi/jitsi-meet/tree/master/react/features/chat