Q: Photo's not 'seen' by Photo

Hi Nijmo,

Welcome to Apple Support Communities.

If I understand correctly, you're concerned because you aren't able to sync all of the phots from your iPhone to your MacBook Air. The article below may explain why this issue is occurring, as it outlines the types of media that the photos can be categorized as and the available options for syncing that kind of media. 

Sync media between your iPhone, iPad, or iPod touch and iTunes on your Mac or PC - Apple Support

                                             

Camera Roll photos and videos	Import your media using Photos, Image Capture, iPhoto, Aperture, or another photo app.     Keep your photos up to date across devices using iCloud Photo Library.     Sync your photos using Photo Stream4.
Photos synced from a computer*	On iOS devices, you can use iCloud Photo Library, Photo Stream4, or the sharing feature.     Back up your original photos as a precaution.
iCloud Photo Library and iCloud Photo Stream3	iCloud automatically updates Photo Stream photos on all devices using iCloud Photo Library or Photo Stream4.

Also, this article provides a lot of great information that can help you free up storage space on your iPhone:

Check your storage on your iPhone, iPad, and iPod touch - Apple Support

Cheers.

Thank you for using Apple Support Communities. Due to the nature of the issue importing photos, you may find more information by using another one of these Apple support resources - https://getsupport.apple.com/GetproductgroupList.action.