That is not going to work, especially with TV shows.
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Never put media in the /plex shared folder. It is a sure way to mess up Plex on Synology. Not saying you have done so, just a FYI.
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Follow Plex naming and organization requirements, especially for TV shows (Plex is very picky with them). See Your Media.
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Two very helpful support documents:
Installation & Setup of Plex Media Server on Synology
Synology FAQ (DSM 5 & 6) - Questions, Answers, and a few How-To’s