A. 1. Check the volume settings on your iPhone. Make sure the mute switch is off and the volume is turned up. 2. Restart the app to see if the audio issue resolves itself. Close the app completely and reopen it. 3. Ensure that the audio track is not muted within the app. Look for any audio controls in the editing interface.

B. 4. Try exporting the video and playing it in a different media player to see if the audio issue persists. 5. If the problem continues, consider using a different audio format or re-importing the audio track.