Hi folks. This is hard because I'm not even sure how to google it. I get lots of answers for the wrong 'no entry' badge which isn't my question. I have a photo file on my desktop, the icon is a ...

You can use the macOS Finder's Copy command to copy and paste files. But here's how to use the same command to copy file icons into Preview.

This function can be turned on and off in Finder -> View -> Show View Options by checking the box next to Show Preview Icon, but in some cases it may not work even if you have the setting enabled ...