Send API body with custom connector

Hello All,

I created a custom connector from an API definition. The connection and requests work well in the connector builder, but I’m struggling with the implementation.

I need to send a POST request that requires me to send something in the body section, however I don’t seem to be able to map the body parameter to my activity

Parameters are correctly set:
The image shows a dark-themed user interface displaying a table of parameters with their associated display names, including "body", "tagString", "objAddress", and "pdfFileName". (Captioned by AI)

If I send a test request, I do see a field for the body parameter and works fine

image

But, my activity has no field for the body

image

Am I missing something? thanks for yor help