I have a flow which has the when a new item is created to a SharePoint list trigger. The problem statement is to send the excel attachment from the SharePoint list item to a POST API call. I have researched the community and documentations however I am always getting the unsupported media type error. It will be really helpful if someone can help me with where I am going wrong.
This my current workflow design:


Here is the error:

This works as expected in Postman though.