add additional notes to plex

Signed-off-by: Simon L <[email protected]>

Author: szaimen

community-containers/plex/readme.md

@@ -2,9 +2,11 @@
 This container bundles Plex and auto-configures it for you.
 
 ### Notes
+- This is not working on arm64 since Plex does only provide x64 docker images.
 - This is not working on Docker Desktop since it needs `network_mode: host` in order to work correctly.
+- If you have a firewall like ufw configured, you might need to open all Plex ports in there first in order to make it work. Especially port 32400 is important!
+- After adding and starting the container, you need to visit http://ip.address.of.server:32400 in order to claim your server with a plex account
 - See https://github.com/nextcloud/all-in-one/tree/main/community-containers how to add it to the AIO stack
-- After adding the container, you need to visit http://ip.address.of.server:32400 in order to claim your server with a plex account
 
 ### Repository
 https://github.com/plexinc/pms-docker