Upload image to WCF

[Software2007]

I am having trouble uploading simple image to WCF. I would like to get to it from iOS, but I think my WCF isn't correct. The other methods I have in in my contract work fine, just this one that have to do with the Stream parameter. Can anyone see if there is anything wrong in web.config that would prevent me from uploading into the service?

[ServiceContract]
public interface IGetEmployees
{
// ....

    //Insert Image
    \[OperationContract\]
    \[WebInvoke(Method = "POST",UriTemplate = "json/UploadImage")\]
    void UploadImage(Stream data);

}

public void UploadImage(Stream stream)
{
//Implement here - stream is always null??????
}