Ok but now I have another problem.
I try to set in PMS HttpUI the my movie directory (external USB hdd on Raspberry /var/media/<mydiskname>/). But I don't found my device in list of directory in PMS configuration (UI).
So, I change the configuration into "Plex (LinuxServer.io)" service. I change the directory Movies /var/media/<mydiskname>/movies/".
Appears these notifications Dockers: Plex kill and Plex stop. So I restarted Plex LinuxServer.io service (appear notification Plex start).
But now... UI PMS http://..... don't work! I don't understand!
It's going to appear in the container (and in the Plex gui) as "/data/movies" as the addon settings page says.
You really should read this: LinuxServer.io docker addons and general docker info