Same problem here. This is an absolute showstopper. Very dissapointing.
Audio from MP4 is absent (not playing).
If you upload an MP3 to add to the video even though the original file has audio embedded, the audio channel is activated and appears (speaker icon), and BOTH the video audio and the mp3 play on top of each other. As soon as you remove the mp3 video is mute again despite having embedded audio.
It appears the option to add audio opens the audio channel which is off but overlays audio that is present in the file.
The audio needs to be coded to be present and activated for the mp4 file. It’s mute and there’s no way to turn it on without adding an audio file, which only overlays the new audio file out of sync with the original which is only then audible.
Tried this with both the document audio and element audio. same problem. Please fix urgently!!!
Upload or link an MP4 with audio > Publish > PLAY the file > No sound or icon to turn it on!! its not the browser!!!