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[tom80H]

Based on your logs it looks like there might be a permission issue.

Jul 09, 2020 00:36:07.365 [0x7fc19b913740] ERROR - Failed to create iterator to "/volume1/TV": Permission denied
Jul 09, 2020 00:36:13.277 [0x7ff5fb9bf740] ERROR - Failed to create iterator to "/volume1/FILMS": Permission denied

Can you double-check the “Share” settings on your DSM to verify that the local plex account can access those shares containing your videos?

Edit: There’s a post with some guidance on how to do this in the tips & tricks section

Synology FAQ - Questions, Answers, and a few How-To's

FAQ 19: Setting permissions to allow Plex access to media files Before beginning, it’s important to remember one key point; Plex doesn’t have any special privileges on Synology except for being able to access the Video Transcoding acceleration hardware. It cannot read any of your files unless you expressly grant permission. This is a fundamental principle of Linux (which Synology uses for DSM) Because of how Synology grants permission, access to files is broken into two different …