StorageException: StorageException has occurred.

[RajuSE]

Getting

StorageException: StorageException has occurred.
User does not have permission to access this object.
Code: -13021 HttpResult: 403

service firebase.storage {
  match /b/{bucket}/o {
    match /{allPaths=**} {
 allow read, write: if request.auth != null;
    }
  }
}

Only working with Public access:
allow read, write;

How to setup Public Read access & authenticated Write access?