transfer photos to iphone from computer
Want to transfer photos from my iMac to my iphone
iMac 21.5", macOS 10.13
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I use iTunes to sync photos from my Mac to my devices. It is explained here.
Keep your photos safely stored and up to date on all of your devices - Apple Support
Should you decide to use iCloud Photos, make sure that you know exactly what you are doing before you dive in.