Fixes #12398. All combinations of new/existing upload should now be handled correctly.

3 jobs for UploadRequiredCheckFailed in 6 minutes and 8 seconds (queued for 1 second)
Status Name Job ID Coverage
  Before
passed documentation #8809

00:01:11

 
  Build
passed snapshot #8810

00:03:28

 
  Selenium
passed selenium #8811

00:01:28