When the microphone is connected to the mobile phone and the recorded video is played, the receiver needs to be unplugged from the mobile phone or a headset should be plugged into the receiver
1. When all mobile phones are connected to an external microphone, it is equivalent to connecting a headset with only a microphone, and the mobile phone needs to unplug the adapter connected to the microphone to play the sound.
2. Check whether the short end of the converter is connected to the out port of the receiver, It may be that connecting the adapter to the charging port caused no recording
Figure 2-1 RX Connect Smartphone