Content-Disposition is always null in web api 2

I have a very simple form:

<form id="upload" enctype="multipart/form-data" action="~/Api/File/Post" method="post" >
    <input type="file" name="files[0].media" />
    <input type="submit" value="Submit" />
</form>

When debugging I get the file, but fileData.Headers.ContentDisposition is always null so I can not access the file name. I dont see any other property in the Request object to get the file name.

What confuses me the most is inspecting the request with chromes debugger shows the following details

Accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Content-Type:multipart/form-data; boundary=----WebKitFormBoundary3rLRRBQX6jj7MbWU
------WebKitFormBoundary3rLRRBQX6jj7MbWU
Content-Disposition: form-data; name="files[0].media"; filename="MyFileName.mp4"
Content-Type: video/mp4


------WebKitFormBoundary3rLRRBQX6jj7MbWU--

Any ideas? This looks like it is being sent correctly... (removed file name in example above)