@Greg Jacobson From 360v.24 Release notes:
New option in Content type field of REST Web Service package
You can now use the multipart/form-data option to upload files and data through REST Web Service. The content type multipart/form-data can be used to submit form elements containing files, non-ASCII data, and binary data. This option is available for actions such as POST, PUT, and PATCH.
@Greg Jacobson : Yes its supported from A36.24 please find the release notes below
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