Converting MOV files - loss of audio track

[BikeMike1950]

I've just installed the latest VLC version and converted an MOV file to MP4 format. But the new file does not have audio at all.
But I cannot find any checkbox or parameter that needs to set.
So I'm at a loss of what to do.
Any advice is appreciated.

[Lotesdelere]

It might be linked to these reports:
https://forum.videolan.org/viewtopic.php?f=14&t=150599
https://forum.videolan.org/viewtopic.php?f=12&t=151096
https://forum.videolan.org/viewtopic.php?f=14&t=150849

[BigArt]

Lost hours dealing withVLC converting MOV to MP4 and losing audio.

https://www.youtube.com/watch?v=d-J-QBRMQZY&feature=youtu.be

When I opened the MOV file in MS Photos it did not have sound, although it did in VLC.
However I trimmed 1 second off the front and then saved the trimmed file. It was an MP4 that had the sound.