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That sentence needs more clarity, tell me exactly what you want, it's kind of too passive as it is now. And also "For images is" doesn't make sense because "is" is singular and "images" is plural. Something like "Images need to be PNG or SVG, preferably with a transparent background." Also I think you should tell them what kind of image you want, a logo, screenshot or a banner. Maybe give them an example of what you want.

I dug into your css a bit and found the culprit of not being able to select text. It's this part here:

* {
    -webkit-touch-callout: none !important;
    -webkit-user-select: none !important;
    -khtml-user-select: none !important;
    -moz-user-select: none !important;
    -ms-user-select: none !important;
    user-select: none !important;
    -webkit-tap-highlight-color: transparent;
}