The gesture itself is simple enough: Just open a photo or video, then take three fingers (your thumb, index, and middle finger) and pinch in on the image. If done successfully, you'll see a "Copy" pop-up appear at the top of the display. (Due to the gesture, you may also dismiss the image as well, but as long as you copied it, you're good to go.) You can also simply copy text or an image the old-fashioned way, by highlighting the text and copying it, or long-pressing on an image and tapping "Copy."
In order for this to work, your devices need to be signed into the same Apple Account and be connected to the same wifi network with Bluetooth enabled. In addition, you need to turn on Handoff on all devices. You might already have this setting on, but just in case, go to Settings (System Settings on Mac) > General > Airplay & Continuity > Handoff.
The next time you have a photo or video on one device you need on another, give this a shot over other methods, like AirDrop or texting yourself. Not only is it quicker to share the file, you'll already have pasted the media where it needs to be. Win-win.
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