将文件发布到Web Api 2.0以保存在Amazon S3中

I have setup a MVC WebApi to save files to amazon S3. So when a file is posted I use a MultipartMemoryStreamProvider in order to get the file as a byte array without saving it to server and then send it to S3. I use POSTman plugin to chrome to call my endpoint and the frontend UI uses angular.jsI have setup a MVC WebApi to save files to amaz