Sends a file to the specified user.
async xmpp.sendFile(jabberId : string): Promise<void>
This method sends the file specified by LocalFile to the user specified by the JabberId parameter.
JabberId is the intended recipient of the message. It is of the form user@domain/resource. If a resource is not supplied, all logged-in instances of the user's account will receive the message.
The class supports sending files using In-Band Bystestreams as defined in XEP-0047 and XEP-0096.