You can try to broadcast the voice of the question by trtc.startPlugin('AudioMixer', options) method，this method support to play local audio file or audio track by transfer different parameter，through this method the background audio can be recorded。 More details you can refer the following document ： https://web.sdk.qcloud.com/trtc/webrtc/v5/doc/en/tutorial-22-advanced-audio-mixer.html