/**
  * Adds more images/upload field/s for user to upload.
  *
  * @param appNo
  * @param ra
  * @param appDetailsForm
  * @return application detail screen.
  */
 @RequestMapping(
     value = "detail/{appNo}",
     params = {"addImage"})
 public String addMoreImages(
     @PathVariable String appNo,
     RedirectAttributes ra,
     @ModelAttribute ApplicationDetailDTO appDetailsForm) {
   HpsUploadFileDTO additionalImage = new HpsUploadFileDTO();
   appDetailsForm.addMoreImages(additionalImage);
   ra.addFlashAttribute(APPDETAIL_MODEL_ATTRIB_KEY, appDetailsForm);
   return "redirect:/detail/" + appNo;
 }