I am using OkHttp3 and want to achieve the same result as in postman attached file in android: https://drive.google.com/file/d/0BzRp7y4UMDw_b293c2NMbFoxMHc/view?usp=sharing
The call will send POST with "form-data" key:"wav" and the value an attached audio file from resources
A sample code is what I need