title: ExifTools - Add thumbnail from URL
body: <p>I have two images. One image is local to my machine and the other image is on a server. Is it possible to use a URL to 'store' the thumbnail for an image so it is downloaded when ever access?</p>
  
  <p>I attempted to use -</p>
  
  <pre><code>exiftool '-ThumbnailImage&lt;= images.mentalfloss.com/sites/default/files/styles/mf_image_16x9/public/558828-istock-865223918.jpg' dog.jpg
  </code></pre>
  
  <p>This however fails out because it cannot read/find the url (which does exist).</p>
  
  <p>Can you use a URL for exiftool data?</p>