Question / Help I find no vioce in iphone when I import recorded mp4 to it

[summy00]

After I compare nomal mp4 attributes, I find:
Recording mp4 audio channel: channel0 <== should be "2 channels"

Can I modify audio channel before I record?

 

[Suslik V]

Multi-track video? If so, try to record Output Mode: Simple without multi-track.