I’ve just started using Sonarr after finally biting the bullet and leaving SickBeard behind.
I have one series where a special has wrongly been named as an episode of season 3.
Is it possible to fix this inside the Sonarr UI or do I have to manually rename the file in another program?
You’ll need to rename to to the proper season + episode number (S00Exx) and then you can have Sonarr import it and organize it properly. If Sonarr doesn’t have record of the file you may be able to use manual import pointed at the series folder and then select the proper season + episode, but renaming outside of Sonarr would be guaranteed way to have it work.