Huntsman Mini, Unable to take Nvidia Screenshot?

I love the keyboard, but I have to go back to my full size Logitech keyboard. On my Logitech to take a Nvidia screenshot I press ALT+F1, 2 key presses, and it saves the screenshot on games or sims. But on the Huntsman Mini I have to hold the FN key and press the ALT+F1, 3 key presses, a bit awkward. NO screenshot is saved? I notice on the Huntsman that when I press the FN, the ALT key is not lit, and assume this is not active for use? I wish that had not purchased this keyboard!