Okay, but doesn't fit – Wall Palette - You can easily create a standby screen of your own cute! Let's make the home screen and icon frames using your favorite photos! Review

So I got this app for my iPhone 6, I was super excited. So I designed everything and saved it to my camera roll?. But when I tried to set it to my wallpaper, it didn't fit. I have got to say, I was pretty disappointed. But does anyone know which iPhone this app is compatible for? Please tell me. Thanks!
Review by Fantasyland? on Wall Palette - You can easily create a standby screen of your own cute! Let's make the home screen and icon frames using your favorite photos!.