Hi Jish,
read the reddit link. You should be getting a prompt for SD or USB so looks like you're games aren't being seen.
Did you rename the game ISO's as game.iso? If you did, try just naming them as 'game' (without apostrophes) this is because you may have extensions of known file types set to hidden on your PC, so you may be naming them, unwittingly, as game.iso.iso! It's worth a try