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Android Jellyfin music app with Chromecast support?
(lemmy.world)
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For Fintunes, it's worth asking where you downloaded it from. Was it F-Droid?
I'm part of the Jellyfin Core Team, and for our own official app, the normal one (sideloaded APK or Google Play) has Cast support, while the F-android version doesn't. It's because Casting relies on a Google proprietary SDK module.
I grabbed the apk from the release section of their GitHub page, since they aren't on the play store yet. You're making me wonder if that has something to do with it..