Layer a new audio to an existing video while auto uploading the audio

Hi,

I want to layer an audio to a video like this https://res.cloudinary.com/dv2okuwkb/video/upload/l_video:herokutts:230566bd-9c10-4bca-946c-e4774bfc91aa/AI%20Clients/Thomas/vici1/smake.mp4

original audio is https://chatbot--dialogflow.herokuapp.com/230566bd-9c10-4bca-946c-e4774bfc91aa.mp3 and https://chatbot--dialogflow.herokuapp.com/ is mapped to herokutts

the question is that I want to apply one new audio layer (not yet uploaded to herokutts) to existing video https://res.cloudinary.com/dv2okuwkb/video/upload/v1669820132/AI%20Clients/Thomas/vici1/smake.mp4

here is one audio file name not yet uploaded to herokutts

a79dd17b-d3a6-4b63-a9fd-7a14a4539606

Also replay the video until the audio ends then stop the video