No files will play on clients.

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I would recommend you to use Raspberry PI OS Lite - It's a console based version that uses less ressources then a GUI based OS. If interested, then i would also be able to help you forward, but Raspberry Pi has many limitations compared to bigger setups like Intel NUCs and desktops - I also started with Raspberry Pi, but back then there was a good hardware acceleration driver, but as far as i know, it's not there anymore. (I have Jellyfin 10.9 unstable running on my Raspberry pi just for testing)