I see nothing out of place. You should be able to reach the filebrwoser gui at yourtruenasip:8888, but i would suggest going back to the default filebrowser port of 30051
You could try to switch the Webui port from expose for inter app communication to Publish port on the host for external access
The default username is admin, but the default password is no longer admin. Filebrowser now generates a random default password. You can find it by accessing the clicking on the icon with the three lines on the “workload” tile.