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1. Voice channels in the mobile app.
2. Screen sharing in voice channels (not the game i'm playing, the FULL screen and audio). At least for the PC client.
3. Make possible to send more than 1 image in the same message.
4. Polls for group chats.
5. In group chats, make possible to set specific permissions on each channel (e.g. making some channels read-only).
6. At least for group chats, the messages should not be automatically deleted after a while. I know this is probably not easy to do, but keeping the messages is important. :(

I really like the Steam Chat interface and stability, I hope you keep it like that. :D