Does PlanetPress workflow support RFC 2112 (Multipart/Related Content-Type)?
https://www.rfc-editor.org/info/rfc2112
This would be for a direct POST to the HTTP Server Input with out a HTML form.
More as a method to transfer a PDF and XML file to PlanetPress workflow
Belated follow-up: multipart/related is not supported. We’ve had a single request for it (and I suspect your request stemmed from the same data source provider), but seeing as that mime-type is not widely supported and implemented, it’s unlikely to be added to Connect.