I recently downloaded some YouTube videos that my dad wanted to play through USB with his Android based projector, as it doesn't have the PlayStore and the videos didn't want to play (and I knew they worked fine on my mac) I went quickly to its store just to find out VLC wasn't there, and I didn't have time to sideload stuff (I didn't even know if it was possible), hopefully there was FX File Explorer and that one comes with a video player which was able to save the day.