code: function buildFormFileSizes(submissions) {
    //Grouping By Form Id
    var fileSizesByForm = _.groupBy(submissions, 'formId');
  
    //Getting all files associated with the submissions
    fileSizesByForm = _.mapObject(fileSizesByForm, function(formSubs) {
  
      //Getting File Sizes For All Entries In All Submissions Related To formId
      var allSubmissionSizes = _.map(formSubs, function(submission) {
  
        //For a single submission, get all file sizes
        var submissionFileSizes = _.map(submission.formFields, function(formField) {
          return _.map(_.compact(formField.fieldValues), function(fieldValue) {
            return fieldValue.fileSize;
          });
        });
  
        var totalSize = _.compact(_.flatten(submissionFileSizes));
  
        //Adding all the file sizes for a single submission.
        return _.reduce(totalSize, function(memo, fileSize) {
          return memo + fileSize;
        }, 0);
      });
  
      //Adding all file sizes for all submissions
      return _.reduce(_.flatten(allSubmissionSizes), function(memo, fileSize) {
        return memo + fileSize;
      }, 0);
    });
  
    return fileSizesByForm;
  }
docs: Utility Function To Add All Files Storage Sizes For Submission
  @param submissions