This is a mistake. Never touch permissions for the PlexMediaServer shared folder. Doing so can cause problems with Plex.
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Stop Plex Media Server
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Undo whatever permissions you configured.
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Run FAQ 32: Repairing the PlexMediaServer shared folder to restore correct permission.
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Start Plex Media Server.
Ensure the user PlexMediaServer has at least read only access to the files. See FAQ 29 - DSM 7 - Give PlexMediaServer access to your media.
Make sure you follow Plex’s naming and organization requirements. See the Music section in Plex Documentation → Your Media.