"Opaque Binary Blobs" containing large assets like high-res graphics, media, and game data.
The APK you extracted requires the OBB data to run. An APK is just the engine; OBB is the fuel. Solution: When you extracted the ZIP, you also saw a folder named android/obb/com.example.app . Manually copy that entire folder to your device's internal storage at Internal Storage/Android/obb/ . xapk to apk converter