How to access photos from Photo Safe app
For several years I have stored important photos using the "Photo Safe" app (downloaded from the app store, of course). Now that app does not work under IOS 11, and is no longer available in the app store. There does not seem to be any way to even determine who the developer is/was, and Apple will not allow downgrading to IOS 10 so I can run it and retrieve my photos. So... is there a way to get them back, or are they all lost forever?
iPhone 6s, iOS 11.0.2