fix(ui): fix file download

packages/stream_chat_flutter/example/android/app/src/main/kotlin/com/example/example/Application.kt

@@ -10,8 +10,8 @@ class Application : FlutterApplication(), PluginRegistrantCallback {
         super.onCreate()
     }
 
-    override fun registerWith(registry: PluginRegistry?) {
-        PathProviderPlugin.registerWith(registry?.registrarFor(
+    override fun registerWith(registry: PluginRegistry) {
+        PathProviderPlugin.registerWith(registry.registrarFor(
                 "io.flutter.plugins.pathprovider.PathProviderPlugin"))
     }
 }

packages/stream_chat_flutter/lib/src/utils.dart

@@ -9,7 +9,10 @@ import 'package:url_launcher/url_launcher.dart';
 /// Launch URL
 Future<void> launchURL(BuildContext context, String url) async {
   try {
-    await launchUrl(Uri.parse(url).withScheme);
+    await launchUrl(
+      Uri.parse(url).withScheme,
+      mode: LaunchMode.externalApplication,
+    );
   } catch (e) {
     ScaffoldMessenger.of(context).showSnackBar(
       SnackBar(content: Text(context.translations.launchUrlError)),