docs: def get_upload_key(self):
          """Get the `Key` from the S3 bucket for the uploaded file.
  
          :returns: Key (object) of the uploaded file.
          :rtype: :py:class:`boto.s3.key.Key`
  
          """
  
          if not hasattr(self, '_upload_key'):
              self._upload_key = self.get_storage().bucket.get_key(
                  self.cleaned_data['key_name'])
          return self._upload_key