Problem adding external usb

Hi, I am using nextcloud with a docker image in my raspberry pi 4. The installation was done from the following docker compose:

image: linuxserver/nextcloud
container_name: nextcloud
- PUID=1000
- PGID=1000
- TZ=Europe/Madrid
- /home/pi/compose/data/nextcloud/config:/config
- /home/pi/compose/data/nextcloud/data:/data
- 2443:443
restart: unless-stopped

My problem is when I try to add my 1Tb WD elements 2.5 "usb disk to nextcloud. I have it mounted in the path / media / hdusb, when I push the verification it appears in red, I have not managed to make it appear in green in any way. Curious about all this, is that the / media directory if I can add it and the check appears in green! I don’t know if it could be a problem with the permissions? I’m desperate, I’ve been trying to fix this problem for a long time. Thank you very much !!