Audio saved separately when recording to computer

When I record a meeting, the meeting video and audio save as separate files (an mp4 and an m4a). The video has no sound on it. Why doesn't it just save as a video with audio? 

There is no issue with the audio from my side, because when I record my meeting but opt to save it to the cloud, the audio is there and fine. And if I download it from the cloud, the audio is on the video too. 

I'd rather not save to the cloud, because the video quality and clarity is much better when I save to computer. 

I just want my recording saved to my computer with the audio already on it. Is this not possible? Because it's a deal breaker for me paying for Zoom.

Thanks