Added audio won't play outside of VLC media player

[wildwest450]

I'm super new to editing (2 whole days) and am having trouble with adding sound to my videos. Everything works fine until I open it in another player or upload it to youtube, then the audio won't play, just video.

I take drone footage, add it to VLC, add music and save it. It works perfect in VLC but the audio won't play in any other format.