Upload Files to HTML Form with Google Apps Script
The Google Script will automatically download a file from the Internet and upload it to another HTML form with an HTTP POST request. If the file already exists in your Google Drive, you can use the DriveApp.getFileById() method to retrieve the file and send it to the web form. Also see: Receive Files in Google Drive
Google Developer Expert, Google Cloud Champion
Amit Agarwal is a Google Developer Expert in Google Workspace and Google Apps Script. He holds an engineering degree in Computer Science (I.I.T.) and is the first professional blogger in India.