how to import photos from mac to iphone

Are you using iCloud Photo Library?

• With iCloud Photo Library enabled your Photos Library on the Mac and on the iPhone will be in sync.
• If you are not using iCloud Photo Library sync your iPhone with iTunes. This way you can select albums to sync, see this support page: Sync photos to your iPhone, iPad, and iPod touch in iTunes - Apple Support

This does not help me. I just bought an iPhone6S...I am not using iCloud...I want to import a photo from a folder on my MacBook Pro. When I plug in to my MacBook via USB and open iTunes, I see the iPhone. I click on the iPhone, then click Photos on the sidebar. I get only a message stating, "XXXXXX can access photos in iCloud. Photos can be downloaded to your device via WiFi or cellular network."

There are no checkboxes whatsoever.

I get only a message stating, "XXXXXX can access photos in iCloud.

You should only be seeing this message if your iPhone is syncing with iCloud Photo Library. Check the Settings > Photo & Camera or Settings > iCloud on the iPhone.

If iCloud Photo Library has been enabled on an iPhone, iTunes Photo Sync will no longer be possible to upload photos from your Mac to the iPhone, and it is also not easy to download the photos from the iPhone to the Mac. If you have not only iClod Photo Library enabled on the iPhone but "Optimize Storage" as well, the iPhone will store the full versions of your photosin iCloud and only smaller, optimized versions on the iPhone. Then it is not possible to download the full versions of your photos from the iPhone.