Because it is a video that needs to be recorded. When I was taking a video for Moments before, I also wondered why the music playing was suddenly paused. Later, we slowly discovered that when we were playing songs, recording videos, or turning on the camera for recording videos, the music would be paused. Because we need to record when we record a video, the system automatically turns off the music, which saves you the need to turn it off because you also need to record when recording a video. The phone will turn off the background sound by default when recording, such as When listening to music, the song playback will also be paused if you send a voice message. When taking photos and recording videos on a mobile phone, the audio and video recording function is turned on. When the recording function is turned on on the mobile phone, the public playback function of the mobile phone will be temporarily turned off to record the sounds of the surrounding environment. If the phone is turned on for recording and the music on the phone continues to play, the surrounding sounds will not be recorded. Therefore, in general, when a mobile phone is recording, it cannot play music at the same time.