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Plug the charging end of the iPad's charger cable into the bottom of the iPad, then plug the USB end of the cable into one of your Mac's USB ports. If you're using an iPad charger that has a USB 3.0 connector, you may need to buy a USB 3.0 to USB-C adapter before you can attach it to your Mac. Click the Photos app icon, which resembles a multicolored pinwheel icon, in your Mac's Dock. Click your iPad's name below the "Devices" heading on the left side of the window. If your iPad doesn't show up on the left side of the window, unlock it by pressing the Home button, entering the passcode, and pressing the Home button again. Click each photo that you want to import to do so. If you want to import all photos that aren't already on your Mac, skip this step. This button is in the upper-right corner of the window. Your selected photos will begin importing onto your Mac.  The button will also display the number of selected imaged (e.g., Import 10 Selected). If you're importing all of your iPad's new photos (i.e., photos not on your Mac), click the blue Import All New Photos button instead. Once your iPad's photos have imported to your Mac, you can view them by clicking the My Albums tab on the left side of the window.
Connect your iPad to your Mac. Open  Photos. Select your iPad. Select the photos you'd like to download. Click Import Selected. Wait for your photos to finish importing.