구글폼에서 파일업로드 자동 폴더링 방법

function onFormSubmit(e) {
  var folderName = e.values[folderNameColumn];
  var phone = e.values[phoneColumn];
  var folderName = folderName + " - " + phone;
  var parentFolder = DriveApp.getFolderById('');
  var folders = parentFolder.getFoldersByName(folderName);
  var applicantFolder;
  if (folders.hasNext()) {
    applicantFolder = folders.next();
  } else {
    applicantFolder = parentFolder.createFolder(folderName);
  }
  var driveLinks = e.values[drivelink].split(',');
  console.log(driveLinks.length)
  for (var i = 0; i < driveLinks.length; i++) {
    var fileId = extractFileIdFromLink(driveLinks[i]);
    if (fileId) {
      var file = DriveApp.getFileById(fileId);
      var copiedFile = file.makeCopy(applicantFolder);
    }
  }
}

//file ID 추출 코드를 작성해주세요.
function extractFileIdFromLink(link) {
.
.
.
}