How do you get screenshots to display? there is no documentation at all with this. I have tried jpg, gif, png files named the same as the rom, no luck

I just wanted to say that I forgot to credit Christophe Lennard with the artwork for this emulator. He kindly provided some back when it was known as ZXGP32 (which is why the icon and splashscreen still have that title). I will update the readme on any next release.