无法在cloudstorage存储桶中查看文件并获取公共网址

Question

我在google appengine上有一个应用程序，并将我的文件存储在google cloudstorage中。 这是代码：

    import os
    import cloudstorage as gcs
    from google.appengine.api import app_identity
    from settings import BUCKET_NAME 

    uploaded_file = self.request.POST.get("file")
    uploaded_file_content = uploaded_file.file.read()
    uploaded_file_filename = uploaded_file.filename
    uploaded_file_type = uploaded_file.type


    # This write_retry_params params bit isn't essential, but Google's examples recommend it
    write_retry_params = gcs.RetryParams(backoff_factor=1.1)
    gcs_file = gcs.open(
        "/" + BUCKET_NAME + "/" + uploaded_file_filename,
        "w",
        content_type=uploaded_file_type,
        retry_params=write_retry_params
    )
    gcs_file.write(uploaded_file_content)
    gcs_file.close()

此代码有效，文件不会显示在存储桶中，我也不知道公众网址是否存在以检查文件是否存在。