A. 1. Check casting settings: Ensure that the casting device (like Chromecast) is properly set up and connected to the same Wi-Fi network as your phone. 2. Adjust subtitle settings: In the app, go to 'Settings' > 'Subtitles' and check if the subtitle settings are correctly configured for casting. You may need to toggle the settings off and on again. 3. Restart the casting device: Sometimes, the casting device may need a restart. Unplug it from power, wait for a few seconds, and plug it back in.