Unable to make an HTTP request with a parameter named "Body"

Hi All,
I tried to make a HTTP request using POST method .
I have used HTTP Request wizard.
But here, my request is to pass ‘Attachment’ to the body.
When we tried to preview it , am getting the below error.
"There is already a parameter named “Abc”. Please choose a different value

Question:
How to send POST request using attachment
Kindly help me

Http%20Post%20Method%20Error