This is the closest question (no answer) I have found: https://community.nintex.com/t5/Nintex-for-SharePoint-Forum/Can-Nintex-Workflow-using-Web-Request-Ac...
I need to upload a file to a web service using the JSON action. The POST REST call requires multipart/form-data. I am not sure how to do this or whether it is possible with the JSON action.
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HI @msalamon
You may need to create your own action to deal with this.
In the nintex help on Xtensions there is a guide on multipart file handling.
Files as multipart formdata (nintex.com)
Apologies I'm not a dev so I haven't tried creating my own Xtension as yet but hopefully this may lead you to a solution.
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i am also facing same problem, how can i solve this
