Install If You're Using iOS 11 on your iPhone and iPad
If you are using iOS 11 on your iPhone or iPad you should consider installing macOS High Sierra so that you can take advantage of the new photo and video formats that Apple is using.
These can save you a lot of space on your Mac, up to 40%, which means more room on your Mac, your iPhone and in iCloud. With this upgrade you will know that the photos you shoot on your iPhone will work on your Mac with no problems and with no need to convert and take up more space.
Once you install macOS High Sierra and iOS 11, you will want to make sure you are using the new high efficiency photo and video formats on your iPhone. Go to Settings -> Camera -> Formats -> High Efficiency.
You also get support to copy something on your Mac and paste it on your iPhone and vice versa.
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