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Just to make sure are you using the latest Lightroom App iOS ver 2.5?
As this camera is fairly new,we’re working to profile the new sensors and lenses found in the iPhone 7 and 7 Plus and will have an update available as soon as possible.
You could try posting your query here Shoot in DNG raw in Lightroom for iOS 2.5 as well.
Yup, I'm on 2.5.