fileUploadTestApiController.cs uses example from (http://shazwazza.com/post/uploading-files-and-json-data-in-the-same-request-with-angular-js/) and appears to work for needs for importing file (and related dataType) in a single API call. I don't know enough about processing files in the backend (aka, virtually nothing), so I can't say for sure if this will meet our needs or not.