Can't download multi audio

[realvjay]

Hello Sir
I'm trying to download the video for website, source have the multi audio in the video but when I m trying to download the video, from 4 audio files, any random audio file download and merge with video. How Can i download single video file with merger of all 4 audio file into single video file.
Kindly Help Me

[axcore]

Please show me the video you are trying to download.