TF-32 Add presentation layer of export attachment for ios platform

ios/Runner/AppDelegate.swift

@@ -1,5 +1,6 @@
 import UIKit
 import Flutter
+import flutter_downloader
 
 @UIApplicationMain
 @objc class AppDelegate: FlutterAppDelegate {
@@ -8,6 +9,11 @@ import Flutter
     didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
   ) -> Bool {
     GeneratedPluginRegistrant.register(with: self)
+    FlutterDownloaderPlugin.setPluginRegistrantCallback { registry in
+      if (!registry.hasPlugin("FlutterDownloaderPlugin")) {
+        FlutterDownloaderPlugin.register(with: registry.registrar(forPlugin: "FlutterDownloaderPlugin")!)
+      }
+    }
     return super.application(application, didFinishLaunchingWithOptions: launchOptions)
   }
 }

ios/Runner/Info.plist

@@ -26,6 +26,8 @@
 	<string>LaunchScreen</string>
 	<key>UIMainStoryboardFile</key>
 	<string>Main</string>
+  <key>NSPhotoLibraryAddUsageDescription</key>
+  <string>To save photo to library, we need permission to access your photo library.</string>
 	<key>UISupportedInterfaceOrientations</key>
 	<array>
 		<string>UIInterfaceOrientationPortrait</string>