Не удаётся загрузить изображение в Firebase Storage

Я пытаюсь загрузить картинку в базу данных:

import 'package:firebase_storage/firebase_storage.dart' as fStorage;

XFile? imageXFile;
final ImagePicker _picker = ImagePicker();

String userImageUrl = "";

Future<void> _getImage() async {
    imageXFile = await _picker.pickImage(source: ImageSource.gallery);

    setState(() {
      imageXFile;
    });
  }

String fileName = DateTime.now().millisecondsSinceEpoch.toString();
fStorage.Reference reference = 
fStorage.FirebaseStorage.instance.ref().child("users").child(fileName);
fStorage.UploadTask uploadTask = reference.putFile(File(imageXFile!.path));
fStorage.TaskSnapshot taskSnapshot = await uploadTask.whenComplete(() {});
await taskSnapshot.ref.getDownloadURL().then((url) {
            userImageUrl = url;
          });

Но в терминале выдаёт ошибку:

E/StorageException(22431): StorageException has occurred.
E/StorageException(22431): User does not have permission to access this object.
E/StorageException(22431):  Code: -13021 HttpResult: 403
E/StorageException(22431): The server has terminated the upload session
E/StorageException(22431): java.io.IOException: The server has terminated the upload session
E/StorageException(22431):  at com.google.firebase.storage.UploadTask.serverStateValid(UploadTask.java:339)
E/StorageException(22431):  at com.google.firebase.storage.UploadTask.shouldContinue(UploadTask.java:308)
E/StorageException(22431):  at com.google.firebase.storage.UploadTask.run(UploadTask.java:229)
E/StorageException(22431):  at com.google.firebase.storage.StorageTask.lambda$getRunnable$7$StorageTask(StorageTask.java:1072)
E/StorageException(22431):  at com.google.firebase.storage.-$$Lambda$StorageTask$q9YBoR_A8LB-JxTCx8JRQvabaZs.run(Unknown Source:2)
E/StorageException(22431):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
E/StorageException(22431):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
E/StorageException(22431):  at java.lang.Thread.run(Thread.java:929)
E/StorageException(22431): Caused by: java.io.IOException: {  "error": {    "code": 403,    "message": "Permission denied."  }}

Вот правила Firabase Storage:

rules_version = '2';
service firebase.storage {
  match /b/{bucket}/o {
    match /{allPaths=**} {
      allow read, write: if true;
    }
  }
}

Как исправить ошибку?