Creating a file upload application

You can create an application to upload any file to Drive from the browser. Create the doGet and uploadFiles functions in the Code.gs file as listed here:

In the Code.gs file, add this code:

function doGet() {
  // Let's return html page created from the Form.html file.
  return HtmlService.createHtmlOutputFromFile('Form.html')
    .setTitle("File Upload");
};

function uploadFiles(form) {
  // You can change the folder name as you like.
  var folderName = "Uploaded Files";

  var folder, folders = DriveApp.getFoldersByName(folderName);
  
  // folders is an iterator.
  if (folders.hasNext()) folder = folders.next();
  // Let's create a folder if it does not exist.
  else folder = DriveApp.createFolder(folderName);
  
  // Let's create the file, got from the form, within the folder.
  var file = folder.createFile(form.file);

  // Let's return the file's url
  return file.getUrl();
}

The uploadFiles function looks for an existing folder with the name Uploaded...