Can't upload my MP3 files - relative path

Why doesn’t Evanto provide an upload MP3’s option as they do for Choose Default Image, or a drag and drop option. Instead they ask for a relative path for LBG Audio2 HTML5. I have tried everything under the sun and every time I get, “does not contain any MP3 files”. Every other plugin I use has the search for feature, so I was so disappointed when I discovered this. I’m stuck and without an audio player at this time.

I’m using WP on Hostgator.