我正在尝试此链接中显示的 FireStore 的新导出功能，但我不断收到错误消息：
gcloud alpha firestore export gs://backup --async
ERROR: (gcloud.alpha.firestore.export) PERMISSION_DENIED: Service account does not have access to Google Cloud Storage file: /backup. See https://cloud.google.com/datastore/docs/export-import-entities#permissions for a list of permissions needed. Error details: projectABC@appspot.gserviceaccount.com does not have storage.buckets.get access to backup.
我已经运行命令将我的服务帐户添加为 storage.admin，并且该命令成功：
gcloud projects add-iam-policy-binding projectABC --member='serviceAccount: projectABC@appspot.gserviceaccount.com' --role='roles/storage.admin'
有人可以帮忙吗？