code: function getRequestFileParameters(req, res, next) {
    //A valid getForms request must have an appId parameter set
    var submitFileParams = {};
    submitFileParams.fileDetails = {};
  
    //Get the content body for normal parameter
    var filesInRequest = req.files;
  
    if (_.size(filesInRequest) === 0) {
      logger.error("Middleware: getRequestFileParameters, Expected A File To Have Been Sent ", {params: req.params});
      return next(new Error("Expected A File To Have Been Submitted"));
    }
  
    var fileDetails = _.map(filesInRequest, function(fileValue) {
      return fileValue;
    });
  
    fileDetails = _.first(fileDetails);
  
    logger.debug("Middleware: getRequestFileParameters ", {fileDetails: fileDetails, body: req.body});
  
    submitFileParams.fileDetails = {
      fileStream: fileDetails.path,
      fileName: fileDetails.originalname || fileDetails.name,
      fileType: fileDetails.mimetype,
      fileSize: fileDetails.size
    };
  
    req.appformsResultPayload = {
      data: submitFileParams,
      type: constants.resultTypes.submissions
    };
  
    logger.debug("Middleware: getRequestFileParameters ", {params: req.appformsResultPayload});
  
    return next();
  }
docs: Middleware For Populating File Parameters From A Multipart Request
  
  Used For Updating Submission Files
  @param req
  @param res
  @returns next