

Are you closing the spectacle window after taking a screenshot? I found that you need to keep it open for the image to stay in the clipboard. When I have the time I can check how I’ve set it up if that doesn’t work for you. Although I only copy to clipboard, not save as well.
Yes it runs on windows, if I recall it’s to pass data from storage to the GPU directly without passing through the CPU. Which lowers CPU usage and speeds up things like game loading or texture streaming for example. You probably found references to Xbox because it was implemented there first with the launch of the current gen consoles.