I wish I’d heard about this a lot earlier, but it turns out Apple’s essentially blocked access to app folders in iOS 8.3. This means that unless a developer has specifically enabled file sharing, utilities such as iExplorer, iMazing and Phone View can no longer access the Documents and Library folders of any app you’ve installed on your device. And that means no saving game data and/or sideloading it across devices.

Right now, the only advice is to stick with (or downgrade back to) iOS 8.2, use a jailbroken device, or cross your fingers and hope one of the devs manages to work around this issue. Oh, and if you’re a game dev, now would be a really good time to consider iCloud game saves and/or allowing file sharing access to game-save data.