How to have multiple Content-Disposition in a mutipart/mixed request?

Hey guys,

I’m using Postman to connect to my Tableau API and I have an issue using the API to post a file.
The API is used to send a file AND send a JSON request in the same request. Both parts need to have a specific Content-Disposition in the header but I don’t know how to do it.

I’ve tried everything and searched every possible solution but I’m still stuck with an internal server error 500, clearly indicating that the request is badly formed. Plus, in the console I can clearly see that only one header is sent.

I want to have a request looking like this :
(See Publishing a file in the request body)

Is it possible using Postman ?

Thanks in advance,