How can my app access any cloud drive app?

My app needs to share data files with multiple devices owned by a single user. I also want to implement this mechanism without setting up a server. Therefore, I want to make it read/write to local data on the user's own cloud drive (e.g. iCloud, Google Drive, One Drive, Dropbox) and read/use them as needed.

I have tried “.fileImporter” to get the URL, but the button is grayed out and cannot be opened.

Sorry for my poor English.

struct FilePathSettingView: View {
    @State private var isPickerPresented: Bool = false
    var fileControll = FileControll()
    
    var body: some View {
        VStack {
            Text("Storage Setting")
            Button(action:{
                isPickerPresented = true
            })
            {
                Text("Select place")
            }
            .fileImporter(
                isPresented: $isPickerPresented,
                allowedContentTypes: [.directory, .folder],
                allowsMultipleSelection: false,
                onCompletion: { result in
                    switch result {
                    case .success(let urls):
                        guard let url = urls.first else { return }
                        let accessGranted = url.startAccessingSecurityScopedResource()
                        defer {
                            if accessGranted {
                                url.stopAccessingSecurityScopedResource()
                            }
                        }
                        guard accessGranted else {
                            print("Failed to access security-scoped resource.")
                            return
                        }
                        fileControll.createDirectoryStructure(in: url)
                        
                    case .failure(let error):
                        print("Failed to select directory: \(error.localizedDescription)")
                    }
                }
            )
        }
    }
}