Trying to add sprites/images to my stage.def files so I can have preview images at the bottom of my select screen. The one that shows now is what I believe is just a default image or something.
Your select screen can't read anything from your stage files other than their name.If you want a stage preview in your screenpack you need to rename all your stages to a single glyph ("A" , "a"...) and then make a font file with each stage image mapped to their specific glyph.