Tap the downloaded APK and press "Install." Once installed, open the app. It will request permissions:
| Problem | Likely Cause | Fix | |---------|--------------|-----| | Wallpaper stops after screen off | OEM battery saver | Add XK to "Protected apps" / "Auto-start" | | Video lag/jitter | High bitrate >20 Mbps | Re-encode video to 10 Mbps or lower | | No lock screen video | Android 12+ permission missing | Settings → Apps → XK → Display over apps → Allow | | Audio plays briefly | Faulty codec | Use MP4 with AAC audio (muted in app anyway) | xk video wallpaper android