Alright, for anyone stumbling across this, I’ve got some clarity here.
If you have a video that already has audio, you can use a free program like VLC to convert the video to an mp3 file and then use an online converter to turn it into a wav file. Wav files are what UE4 uses for sound. If you cue the video and audio in the same function, they will be in sync (maybe a millisecond delay as the code executes but really, that’s nothing). The Media Sound component would not be necessary if you are playing the sound in a widget, that’s for an actor somewhere in your level, like a tv or something like that. Just import the original video as a File Media Source, make a Media Player (in your content browser, ideally in the same folder as the source for organizational purposes) and use those two things to make a Media Texture that you can use in your widget.