I have an iPhone 7 plus 128Gb with iOS 10.2. I also have iCloud photo library with 200Gb. However looking in storage settings, photos and camera is still using 30Gb. I have "optimise iPhone storage" on in photos and camera settings. I believe clicking on a photo to view it downloads it from iCloud, so I'm presuming is this what has happened. Is there any way to flush or reset this? I know it's supposed to do this automatically if I start to run out of space, but is there a way to do this manually?