Uploading File and Employee Model in POST Web API

It's impossible to use [FromForm] and [FromBody] simultaneously as is mentioned here. But I think You have 2 choices:

 

You can either put your JSON body into a form and send Employee data besides the File or use 2 separate endpoints for form upload. An endpoint for uploading user picture using [FromFile] and obtaining a pictureId and another for sending Employee in the body with populated pictureId key.