All the devices must be on the same Wi-Fi network.All Macs must be running macOS 10.12 Sierra or later, and all iOS devices must be running iOS 10 or later.Since Sierra runs on most Macs introduced since late 2009, Universal Clipboard won’t work on some older but otherwise Sierra-capable Macs. Choose  > About This Mac to check your Mac’s age. Any Macs involved must have been introduced in 2012 or later, or, in the case of the Mac Pro, 2013 or later.

Miss any of these and Universal Clipboard will fail to copy the clipboard contents from device to device without warning. But what if it doesn’t? It turns out that six things must be true for Universal Clipboard to work. You can’t turn it off or configure it in any way. Neither Sierra nor iOS 10 provides any interface for Universal Clipboard at all. Universal Clipboard even works with graphics and videos. Or copy an incoming phone number in the Phone app and paste into an email message on your iMac. Copy some text on your iMac and a few seconds later you can paste it on your MacBook Air, your iPhone, or your iPad. As you’d expect from the name, Universal Clipboard transfers anything you copy to all your devices so you can paste anywhere. Install macOS 10.12 Sierra on your Macs and iOS 10 on your iOS devices and you’ll get a cool new feature: Universal Clipboard.

How to clear clipboard mac sierra