Nextcloud Web Admin Page in Docker Setup

Hey guys

I have Nextcloud running in docker container and would like to know if it’s possible to have the webadmin page available which is on port 4443 and which you can only access internally? Do I need to configure the nextcloud docker compose file for that?

And do I need to first mount my usb drive as volume in docker nextcloud file to be able to mount it then in Nextcloud gui in the App external storage? If so which path I need to use then? I think that one which is mounted to the container right?