I'm currently building an application, where i want to open files with a custom extension (but it's xml content) with my app. For iOS i have the problem, that i get PathAccessException trying to open the file, when the app is closed. But running in the background, it works just fine.

I'm using a EventChannel for when the App is in Background (resume) and a MethodChannel on AppLaunch. I'm also accessing the url in both ways via startAccessingSecurityScopedResource and stopAccessingSecurityScopedResource, when the job is done.

I'm confused because this Problem occurs running the app on my phone, but not on the Simulator. Also it's confusing that it works, when the application is open in the background but not on startup.

I've tried various ways of calling url.startAccessingSecurityScopedResource() in different states of the app. But it should work on appLaunch as well.

The code below in handleFileUrl works for resume, but not on app launch

override func application(
    _ application: UIApplication,
        didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? ) -> Bool { 
    setupEventChannel()

    if let options = launchOptions, let url = options[.url] as? URL, url.isFileURL {
        pendingFilePath = handleFileUrl(url: url)
    }

    GeneratedPluginRegistrant.register(with: self)
    return super.application(application, didFinishLaunchingWithOptions:launchOptions)
}

private func handleFileUrl(url: URL) -> String { 
    var filePath: String    
    let securityGranted = url.startAccessingSecurityScopedResource()

    
    let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
    let fileName = url.lastPathComponent
    let destinationURL = documentsDirectory.appendingPathComponent(fileName)
    
    do {
       
        if FileManager.default.fileExists(atPath: destinationURL.path) {
            try FileManager.default.removeItem(at: destinationURL)
        }
        
        
        try FileManager.default.copyItem(at: url, to: destinationURL)     

        filePath = destinationURL.path
    } catch {
        filePath = url.path
    }

    if securityGranted {
        url.stopAccessingSecurityScopedResource()
    }

    return filePath
}