It was said that 256x256 or larger icon size layers are stored as PNGs when the icons are created. However, has anyone successfully created an icon that's larger than 256x256? I'm currently trying to create some that are 296x296 but the custom size is not being recognized. Is this b/c the images are not powers of 2, or was the "or greater" just wishful thinking? I am using version 126.96.36.199.