how to copy and paste across apple devices:

You can copy and paste text, images, and files on your iPhone, iPad, and Mac, but you can do the same across different Apple devices thanks to the built-in Universal Clipboard. You can also use the AirDrop. 

You can paste an image from your iPad into any app on your Mac. You can also copy text from your Mac and put it in an email. You must enable the same options on all your devices to make it work. Once you enable certain options across all devices, it is possible to paste the copied item multiple times.

This means that if you make a copy of something, it will be replaced by the original one. Keep in mind, copied content will only be available for a limited time so make sure you don't leave it too late.

The Universal Clipboard must be able to recognize and use these items. Your Mac should run OS X Sierra, and your iPhone or iPad need iOS 10. The Mac and iOS/iPadOS devices must meet the following requirements: Each device must sign into iCloud using the same Apple ID, and both Bluetooth AND Wi-Fi must be turned on

You can check if they are turned on by looking at the icons in the status menu located right-hand side of your Mac. Alternatively, open System Preferences > Network > Bluetooth PAN to confirm that Wi-Fi and Bluetooth are turned on, respectively.

Do this on a Mac from System Preferences > General and select the Allow Handoff between this Mac and your iCloud devices option if it's not already checked.

To enable Handoff on an iOS/iPadOS device, go to Settings > General > AirPlay & Handoff and turn on the switch for Handoff if it's not already on.

Next, turn on Handoff for iOS/iPadOS by going to Settings > General > AirPlay & Holdoff. Open Safari on your iPhone and copy the URL. Switch to Safari on your iPad. Next, tap on the URL you are currently using in the address box. The URL copied in Safari on iPhone will be pasted to Safari on iPad by tapping Paste. The URL can be copied into any other iPad app, such as Notes, Mail and Messages. To paste the URL, tap the desired spot on the screen.

Open the photo in the Photos app for iPhone. Tap on the Copy Photo icon, then tap the Share button. Open the iPad app where you wish to copy the image. Tap or long press the spot where the photo should appear.

Then, tap Paste. Tap the Book app icon, then tap Copy. Open an iPhone app where you wish to copy the link to your book. Hold down or tap the area you want to paste the link and then select Paste.

Next, we'll get our Mac involved in the action. Copy a photo using the Photos app on your iPad. Open Pages on your Mac. Click on the area where you wish to insert the image and then press Command + V.

Or right-click to select Paste. Copy the text from the Hardware Overview screen. You can also copy the content from more than one Mac to open an iPad program like Mail or Messages.

Open the folder containing the file that you wish to copy on your first Mac. Click on the file to open it and choose the Copy command. Move to the second Mac. To paste, open the folder you want to copy and hit Command + V.