通过macOS本机应用程序中的SwiftUI WKWebView调用时，如何使文件打开对话框起作用？

我目前正在运行一个用SwiftUI制作的简单化WkWebView-可以从StackOverflow帖子中瞥见所有建议。它打开一个网站。该网站有一个浏览器按钮。如果单击Safari上的浏览器按钮，则会打开Finder窗口。如果我在用Xcode创建的.app中执行相同的操作，则Finder窗口不会打开。

这是我在沙箱中启用的内容：

我使用的代码是这样（全部来自ContentView.swift）

import SwiftUI
import WebKit


public struct WebBrowserView {

    private let webView: WKWebView = WKWebView()

    // ...

    public func load(url: URL) {
        webView.load(URLRequest(url: url))
    }

    public class Coordinator: NSObject, WKNavigationDelegate, WKUIDelegate {

        var parent: WebBrowserView

        init(parent: WebBrowserView) {
            self.parent = parent
        }

        public func webView(_: WKWebView, didFail: WKNavigation!, withError: Error) {
            // ...
        }

        public func webView(_: WKWebView, didFailProvisionalNavigation: WKNavigation!, withError: Error) {
            // ...
        }

        public func webView(_: WKWebView, didFinish: WKNavigation!) {
            // ...
        }

        public func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {
            // ...
        }

        public func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
            decisionHandler(.allow)
        }

        public func webView(_ webView: WKWebView, createWebViewWith configuration: WKWebViewConfiguration, for navigationAction: WKNavigationAction, windowFeatures: WKWindowFeatures) -> WKWebView? {
            if navigationAction.targetFrame == nil {
                webView.load(navigationAction.request)
            }
            return nil
        }
    }

    public func makeCoordinator() -> Coordinator {
        Coordinator(parent: self)
    }
}


#if os(macOS) // macOS Implementation (iOS version omitted for brevity)
extension WebBrowserView: NSViewRepresentable {

    public typealias NSViewType = WKWebView

    public func makeNSView(context: NSViewRepresentableContext<WebBrowserView>) -> WKWebView {

        webView.navigationDelegate = context.coordinator
        webView.uiDelegate = context.coordinator
        return webView
    }

    public func updateNSView(_ nsView: WKWebView, context: NSViewRepresentableContext<WebBrowserView>) {

    }
}
#endif

struct BrowserView: View {

    private let browser = WebBrowserView()

    var body: some View {
        HStack {
            browser
                .onAppear() {
                    self.browser.load(url: URL(string: "http://specificwebsitewithbrowserbutton")!)
                }
        }
        .padding()
    }
}


struct ContentView: View {

    @State private var selection = 1

    var body: some View {
                BrowserView()
                .frame(maxWidth: .infinity, maxHeight: .infinity)
    }
}

那么，如何为该.app提供足够的权限，以便在我单击网站上的“上传”按钮时打开Finder窗口？