How can I add 2 audios to a video?

I tried to upload a mp4 video with 2 audios in mp3 or AAC format and when the platform encodes the video it leaves only a single audio in AAC format so the selector does not work to change the audio. What transcoding profile must be created to make it work?

Please see https://github.com/kaltura/server/issues/6795#issuecomment-366982715