Plex doesn't show files from my external hard drive

I’ve set up Ubuntu on my raspberry PI. Then I’ve installed Plex media server on this Ubuntu installation. After this I try to connect my external hard drive with the Plex media server (so I can play the media on it). The problem is I don’t get to see any files here if I want to add them to Plex.

I can’t see the files of my external hard drive in Plex:

I can see the files of my external hard drive on Ubuntu:

Specs of my external hard drive:

How I can make sure that Plex can read the files on my external hard drive?

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