How does Postman retrieve cookies from the server?

I have been using Postman for about three years but do not consider myself an expert.

I am trying to make a POST request work and having some difficulty. I received a simple collection from the developers of the API. The POST request in the Postman collection works but my implementation of it in our development environment does not.

I noticed that when I issue the POST request from Postman it adds a number of cookies to the Cookie Jar. If I turn the Cookie Jar OFF (in Settings), the request doesn’t work–just like my implementation! If I delete the cookies, Postman re-adds them. Obviously, the cookies are necessary. The request has NO pre-request scripts.

So, my question is how does Postman retrieve cookies from the server without knowing the cookies’ names?

Postman v9.13.1
Chrome Version 97.0.4692.99 (Official Build) (64-bit)
Windows 10