Notice there is no separate "Unity plugin" file. The APK contains the libunity.so and libmono.so files inside it. You just install the APK.
Here's the key information:
Practical approaches and recommended workflows
While some users might look for ways to play Unity-based PC games on Android, JoiPlay does not natively support the Unity engine. Official JoiPlay Plugins
Notice there is no separate "Unity plugin" file. The APK contains the libunity.so and libmono.so files inside it. You just install the APK.
Here's the key information:
Practical approaches and recommended workflows
While some users might look for ways to play Unity-based PC games on Android, JoiPlay does not natively support the Unity engine. Official JoiPlay Plugins