How to transfer from my Photos app on the Mac to my phone/tablet?
Ensure PhotoSync is installed on both your source device and target device. The PhotoSync Companion application software for your Mac is available at our Downloads page.
To send one or more photos/videos from your Mac Photos app, just select one or more photos/videos inside the Photos app.
Now click the share button in the top toolbar of your Photos app and select PhotoSync from the share menu. If PhotoSync is not listed in the share menu, click on More... and add PhotoSync to that menu.
Continue your transfer as described in How to transfer from my Mac to my iPhone/iPad? and How to transfer from my Mac to my Android phone/tablet?