Can't add any files to media source

[GeorgeTheLFox]

Right now I'm using OBS through StreamElements, and for some reason when I try to add a Media Source, it can't find any of my files. Even if I copy them from my files to the popup, it doens't let me open them and says it can't find the file. Help? Trying to get this to work so that I have pre-stream, break, and after-stream scenes.