If you want to run his config, that’s fine but be advised.
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It’s completely independent of the native packages
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None of your existing metadata will be used. He puts everything in his own place. You’ll start out with a brand new server
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There will be no hardware transcoding (not configured in that definition)
What he’s created is a generic plex container with none of the benefits.
You’d be better off running the official Plex Docker container.
I have configurations, with hardware transcoding, which fully overlay both DSM 6 and DSM 7