def transmit(self, transport, data, content_type):
    """Transmit the resource to be uploaded.

    Args:
        transport (~requests.Session): A ``requests`` object which can
            make authenticated requests.
        data (bytes): The resource content to be uploaded.
        content_type (str): The content type of the resource, e.g. a JPEG
            image has content type ``image/jpeg``.

    Returns:
        ~requests.Response: The HTTP response returned by ``transport``.
    """
    method, url, payload, headers = self._prepare_request(
        data, content_type)
    result = _helpers.http_request(
        transport, method, url, data=payload, headers=headers,
        retry_strategy=self._retry_strategy)
    self._process_response(result)
    return result