title: What happens when auth token expires while uploading to firebase storage?
body: <p>I have an application where users can upload multiple large video files (in GB) simultaneously and sometimes, for some, over slow networks. There's also a storage.rules in place to ensure that only authenticated users can upload video files and that a file been uploaded is of the right content-type.</p>
  <p>The issue is that the uploads fail after a while (E:400), sometimes after 54mins, leaving me curious as to whether it was about the file size or upload timeout. But since I'm able to upload these files over fast network, it rules out file size. Now, I wonder if, in addition to timeout, the auth token sent to firebase storage (GCS) when the upload started could expire and cause the upload to fail?</p>
  <p>This is all the error (exception) message I got.</p>
  <blockquote>
  <p>FirebaseError: Firebase Storage: An unknown error occurred, please check the error payload for server response. (storage/unknown)</p>
  </blockquote>