How to pass dynamic Unique ID to convertAPI

Hello,

Stuck with a problem how to pass dynamic Unique ID from Data Base to API.

Installed connector API and set up connection with convertorAPI to generate pdf.

When you setting up initial API call to convertorAPI you are required to type url adress of file you want to convert into pdf.

How can I pass dynamic data? In the workflow when I call created plugin it does not provide option to pass dynamic url. There is only option “Only when”.

So in the end I am stuck with generating only single page into pdf and cant create workflow wich will allow to place button “Generate PDF” on every page of app I want to convert.

Upd.
Found the reason why api field for dynamic data was not available in workflow.
Dynamic field in JSON body should be marked not private. By defauld it is ‘private’.