Intellij IDEA REST Client file uploading

I am trying to upload file through Intellij IDEA REST Client. I choose "File to upload (multipart/form-data)" and choose file to send. What is parameter name of this file? In my Sprint Controller i use this code

@RequestMapping(method = RequestMethod.POST, value = "/{id}/photo")public void setCover(@PathVariable int id,                     @RequestParam MultipartFile file) {    System.out.println(file.getName());}

I also tried different names, such as "file", "fileToSend", "File to send" for @RequestParam, but Spring always cant find MultipartFile paramater.