Specials is the folder Sonarr will use when season folders is enabled on the series (and Sonarr imports or renames the file).
We’ll need more information to troubleshoot it not working though.
Sonarr version (exact version):
Mono version (if Sonarr is not running on Windows):
(Make sure debug logging is enabled in settings and post the full log to hastebin/pastebin/dropbox/google drive or something similar, do not post them directly here)