I can add apps to Samsung games launcher, but the “game plugins” works for games that are in a db. For example, if I sideload retroarch_x64 from nightlies it appears there but retroarch_x32 build is not in the db. The app that handle the db is “game optimizing service” a system app. With my older phones and older “game launcher” and/or older “game optimizing service” versions, I could add games to it and game plugins were working, but that’s not the case anymore.