9-downloadUrl

Drive-9

//Get file 'Reference Doc', make PDF download link & email it. //examples.gs
function example91() {
  var fileId = getFileId();

  var downloadUrl = 'https://docs.google.com/document/d/'
    + fileId + '/export?format=pdf';

  sendEmail(downloadUrl);
}

//Get file 'Reference Doc', make PDF, add to folder,
//get download URL and email it
function example92() {
  var fileInfo = getFileInfo();

  var docPdf = makePdf(fileInfo);

  var downloadUrl = docPdf.getDownloadUrl();

  docPdf.addViewer('brgablog1@gmail.com');

  sendEmail(downloadUrl);
}

//commonFunctions.gs - Separate script file
//Gets files named "Reference Doc" and return file ID
function getFileId() {
  const folder = DriveApp.getFolderById('ADD YOUR FOLDER ID HERE');
  var files = folder.getFilesByName('Reference Doc');
  while (files.hasNext()) {
    var file = files.next();
    var fileId = file.getId();
    return fileId;
  }
}

//Send email with download link
function sendEmail(downloadUrl) {
  MailApp.sendEmail('brgablog1@gmail.com',
    'Reference Doc - Download Link',
    'Download the file from here: '
    + downloadUrl);
}

//Gets files named "Reference Doc" and return file ID
function getFileInfo() {
  const folder = DriveApp.getFolderById('ADD YOUR FOLDER ID HERE');
  var files = folder.getFilesByName('Reference Doc');
  while (files.hasNext()) {
    var file = files.next();
    var fileId = file.getId();

    return {
      fileId: fileId,
      file: file,
      folder: folder
    }
  }
}

//Get file by ID, make PDF, add PDF to folder
function makePdf(fileInfo) {
  const pdf = DriveApp.getFileById(fileInfo.fileId)
    .getAs('application/pdf');
  pdf.setName(fileInfo.file.getName() + ".pdf");

  const docPdf = DriveApp.createFile(pdf);
  docPdf.moveTo(fileInfo.folder);
  return docPdf;
}