title: How to create Google Sheets file when CSV file is downloaded
body: <p>When a user downloads a CSV file from an arbitrary site, I would like to be informed of this event and automatically upload the same file as a Google Sheets file.  Is this possible or would this be violating a fundamental browser security concept?</p>
  
  <p>The CSV file in question does not have a URL, but is created on the fly by the arbitrary web site, when the user clicks a button.  An example would be the user's list of financial transactions at a bank web site.</p>
  
  <p>I am not new to Google Apps/Drive but I am new to Google Apps Script.</p>