Process deployment to REST API through postman

It should be form-data only. Don’t set content-type in headers tab, which is not required. setting form-data in body tab is enough for deployment. Postman is smart enough to fill this header (Content-type) for you. So explicitly setting of content-type not required.

https://developer.esignlive.com/forums/topic/upload-a-new-document-through-multipartform-data-using-postman/

https://developer.esignlive.com/code-share/upload-document-multipartform-data-using-postman/