not ready for iOS

lib/util/fileUtils.dart

@@ -4,6 +4,8 @@ import 'dart:math';
 import 'package:convert/convert.dart';
 import 'package:crypto/crypto.dart';
 import 'package:path/path.dart' as path;
+import 'package:file_selector/file_selector.dart' as file_selector;
+import 'package:path_provider/path_provider.dart';
 import 'logger.dart';
 
 
@@ -104,3 +106,22 @@ deleteDirectory(String path) async {
 }
 
 
+
+Future<String?> getSaveLocation({String? suggestedName}) async {
+  if (Platform.isIOS) {
+    final directory = await getApplicationDocumentsDirectory();
+
+    Log.d('iOS get file path: ${directory.path}/$suggestedName');
+
+    return '${directory.path}/$suggestedName';
+
+  } else {
+    final file_selector.FileSaveLocation? selectedFile = await file_selector.getSaveLocation(
+      suggestedName: suggestedName,
+    );
+    if (selectedFile != null) {
+      return selectedFile.path;
+    }
+  }
+  return null;
+}