Help with Plex Media Server not finding any media

Hello, I have a USB plugged into the router and can access it using SMB and succeded to mount it into home assistant using:
sudo docker exec -i homeassistant mount -t cifs -o username=username,password=password,domain=WORKGROUP //192.168.0.1/disk2_1 /media/router_usb

And can see the movies under the Media tab but cannot see the media inside the file browser and cannot be discovered by Plex

I’ve spent 3 days trying to make it work but failed, any Help ?
I’ve installed HA on sdcard on RPi4