uri – change of the PDF URL in drupal

You can solve this problem in many ways, but the easiest way is to simply download the file with the correct (old) name to the location where Drupal is waiting for it. I am not talking about downloading via Drupal but via your hosting account in the appropriate folder.

Another method is to add a redirection from the old URI to the new one, via the Drupal redirection module or the server configuration (usually .htaccess).