I have been browsing and have not been able to find a way to send MTOM attachments, whether it is via SUDS or Zeep python libraries. I see that Zeep allows the reading of MTOM attachments. But not the attachment and send.
Essentially, I already have the raw bytes, but I am trying to send them as an attachment rather than attaching all of the bytes to an object I then send to a service function.