Check in Settings, Photos and you probably have Optimise Storage turned on. This aggressively relies on iCloud to store the actual photos, while keeping a thumbnail cache on the phone.
Yeah I'm assuming it's that, however pretty sure I had this enabled on my 6 but Photos still used to consume gigabytes of internal storage. Maybe iOS 11 just deals with it better. My Mum now has that handset so I'll have to have a nose next time I see her to see if it's doing the same.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.