: .apk files are installers for the Android operating system.

: Use a File Manager app to find the .apk in your "Downloads" folder. Install : Tap the file and follow the on-screen prompts.

: Once finished, the app icon should appear in your app drawer.

💡 : If this is a game, "release" indicates it is a stable build intended for testing, rather than a "debug" build used by developers. To help you better, could you tell me: Where did you find this file ? Is this related to a specific online community or project?