Unable to get savefile write read on IOS

Hi. I need to get write/read for my app. I added the necessary lines to the .plist file. But the application still does not want to read and write data. For some reason, only at the first start it turns out to save the first variable. At the moment I’m using unreal engine version 5.2 Xcode14 IpadOS 16.3.1
NSCameraUsageDescription
NSDocumentsFolderUsageDescription
UIFileSharingEnabled
LSSupportsOpeningDocumentsInPlace
UISupportsDocumentBrowser
UIDocumentBrowserViewController