A. 1. Check volume settings: Ensure that your iPhone's volume is turned up and that it is not muted. You can adjust the volume using the side buttons or through the Control Center. 2. Restart the app: Close the app completely and reopen it to see if the audio files play after a fresh start. 3. Check file format: Ensure that the audio files are in a supported format. If they are not, you may need to convert them to a compatible format or check if the app supports them. 4. Clear app cache: If the app has a cache-clearing option in its settings, use it to clear any corrupted data that may be preventing audio playback.