control meda player thru separate device

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So I think this is what you're asking: can you use a mobile device as a remote control?

Answer: yes, in many cases. The Jellyfin app on the mobile device can be used as a remote control.

https://forum.jellyfin.org/t-remote-cont...46#pid3746

If that's not the question (I originally thought it was about casting or zones within a house), please provide some clarification on your setup and the intended outcome.