title: How to get a file or blob from an object URL?
body: <p>I am allowing the user to load images into a page via drag&amp;drop and other methods.  When an image is dropped, I'm using <code>URL.createObjectURL</code> to convert to an object URL to display the image.  I am not revoking the url, as I do reuse it.</p>
  
  <p>So, when it comes time to create a <code>FormData</code> object so I can allow them to upload a form with one of those images in it, is there some way I can then reverse that Object URL back into a <code>Blob</code> or <code>File</code> so I can then append it to a <code>FormData</code> object?</p>