Downloading question

So on the torrent site i use when the season ends for the show the site deletes all episodes but the 1’st and last 1… then when the season is combined into 1 torrent file sonarr doesnt snatch it. How do i set it so that sonarr will snatch the season once its created

Sonarr won’t if it already has at least one episode in the season at the cutoff already. If you want to grab those to seed long term you’ll need to handle that outside of Sonarr or do it through interactive searches in Sonarr.