Upload files to Asp.NET MVC 4-Web API-Http PUT method

So, I have to make a method in my controller for an API that accepts 2 files via PUT (1 json and 1 xml for Data Processing, not for saving the files), and I have to send the request by fiddler.. My request in fiddler is as follows (put Method):

Content-Type: multipart/form-data
Authorization: XXXXX 
Host: XXXX

Request Body:

<@INCLUDE *C:\Users\ZZZZ.json*@>
<@INCLUDE *C:\Users\XXXX.xml*@>

Here is my controller code so far (not working)

[HttpPut, Route("api/Student/{studentId}/Classes/{classId}")]
        public async Task<string> Put(int studentId, int classId)
        {
                var file = HttpContext.Current.Request.Files.Count > 0 ?
            HttpContext.Current.Request.Files[0] : null;
            Stream fileContent = await this.Request.Content.ReadAsStreamAsync();
            MediaTypeHeaderValue contentTypeHeader = this.Request.Content.Headers.ContentType;

            if (fileContent != null)
                return "ok";
            return "not ok";
        }

So far the file is not uploading ne, it appears in the variable "Request". I also don't have the request property.File. I also tried HttpContext and also had nothing.

I tried the exact same thing but with the POST method (it adds boundaries automatically in the fiddler request, and then I can see the filenames in my controller, but I can't read any of them...

What would they do to make this work? I even have to have one object in json and another in xml... Files have a dynamic structure, i.e. it is not worth creating a specific object for them.

PS: how would they then read the same files without saving them to disk first?