[dmitriid]

XEP-0363: HTTP File Upload

> WARNING: This Standards-Track document is Experimental. Publication as an XMPP Extension Protocol does not imply approval of this proposal by the XMPP Standards Foundation. Implementation of the protocol described herein is encouraged in exploratory implementations, but production systems are advised to carefully consider whether it is appropriate to deploy implementations of this protocol before it advances to a status of Draft.

It means that there will be one client that supports this (Conversations for Android) and maybe one server supporting this (probably ejabberd). Good luck navigating the minefield :)

Meanwhile I can install Slack on multiple devices and have the same functionality everywhere :)