I've been on iOS 10 (Public Beta) since it came out, and it's great, except for one issue. It's gotten rid of all my free space. At the time of installation, I had about 1.3 GB of free storage. I now have "Zero KB" coming up on the display, despite the fact I deleted a number of apps earlier. I feel that the biggest problem is my iCloud Photo Library. I have got "Optimise iPhone Storage" turned on, heck I've only got the 16 GB model, but it's not deleting the local pictures. In iOS 9, you could find a picture, download it, use it, and then leave the app. After a short time, the photo would be deleted from your device, but remain in iCloud. What I'm really looking for is a way to do this, or for someone to give me another great solution. From what I can tell, the beta is producing loads of unnecessary files, then not deleting them, but I can't really confirm this.