You could mount the network share on the host/Ubuntu and then reference it in your docker compose file. It works. I prefer to write the mount in the Docker compose file since it's a bit more portable. Something like this depending on if you're using SMB/CIFS or NFS:

services:
    some_music_app:
        image: music_app_image:latest
    container_name: music_app
    volumes:
      - smb:/some/path/smb/music
      - nfs:/some/path/nfs/music
volumes:
  smb:
    driver_opts:
      type: cifs
      o: "username=${user},password=${pass},uid=1000,gid=1000,vers=3.0"
      device: "//tiger-nas/music/music"
  nfs:
    driver: local
    driver_opts:
      type: nfs
      o: addr=tiger-nas,nolock,soft,rw,nfsvers=4
      device: ":path/to/music/music"

The ${user} and ${pass} in the smb volume definition are variables that you'll need to have in a .env file next to your compose.yaml file. The .env file is just a normal text file with each line setting a value to a variable. Like:

user=my_username  
pass=123_abc_!@#

Then you restrict the permissions of your .env file and you can essentially take a backup of both files and use them on any server with Docker.

Mount the network share (fstab or mount.cifs), and pass the login using the username= and password= mount options. Then point the volume at the mount point's path.

https://www.mattnieto.com/how-to-mount-an-smb-share-to-a-docker-container-step-by-step/

Mount it locally. Then reference the local mount in your docker command or compose file.

My network shared folders are on a windows 11 (yes, I know. It’s shit.) pc and my docker is running on Linux.

Here’s what my mounts look like -

volumes:
  plex:
    driver: local
    driver_opts:
      type: cifs
      o: username=pc_username,password=pc_password,vers=3.0,file_mode=0777,dir_mode=0777
      device: //10.0.0.3/Plex

Hope this helps.

I have a similar setup, I have two servers, one with the arr stack and the other is a NAS server.

I’m my fstab I mount he network drive to say /media, then the docker containers can just have Volume: /media:/media or whatever. If you need more specifics I can look when I get home.

It's been a while so I am relying on some janky notes:

Prep:

sudo apt update
sudo apt install samba

[MyHDD]
path = /mnt/myhdd
available = yes
valid users = yourusername
read only = no
browsable = yes
public = yes
writable = yes

Compose File:

services:
  navidrome:
    image: deluan/navidrome:latest
    user: 0:0  # should be owner of volumes
    ports:
      - "14533:4533"
    restart: always
    environment: {}  # Empty mapping - valid and fixes the error
      # Optional: put your config options here. Examples:
      # ND_LOGLEVEL: debug
      # ND_SCANSCHEDULE: "@every 5m"
    volumes:
      - "/docker-data/navidrome/:/data"
      - "/mnt/myhdd/your/path/goes/here:/music:ro"  # Use forward slashes

Adjust as necessary or applicable. Maybe this will get you headed in the right direction. It'd be helpful if someone double checked my notes. I get nervous when giving instructions. LOL Also it should go without saying that you should do your due diligence verifying any code copied off the internet. Not responsible for ingrown toenails, loose stool, or blurred vision.

I tried it with NFS vol mounted in the compose but had disconnection issues.
In the end I mounted it on the host.

But I don't know the exact issue why I had it.