Hetzner is great but if you just don’t like it, Vultr seems to fill similar gap in the market as Hetzner does.

I think Dashy is the one that gained a lot of popularity, is quite powerful and has option to add things via GUI, it’s great.

Will my response with example from post created few hours ago help? You need to call them as external, in your current example it creates kind of bind mounts that would even change every redeploy.
https://www.reddit.com/r/portainer/comments/17cyn4p/how\_to\_use\_volume\_in\_portainer\_stack

It would be easier if you posted whole compose.
Here’s an example for NPM, that’s how external volume (that is already created via other means) should be called:

version: '3.8'

services:
  app:
    image: 'jc21/nginx-proxy-manager:latest'
    container_name: npm
    restart: unless-stopped
    ports:
      - '80:80'       # Public HTTP Port
      - '443:443'     # Public HTTPS Port
      - '81:81'       # Admin Web Port
    environment:
      DISABLE_IPV6: 'true'
    volumes:
      - npm-data:/data
      - npm-letsencrypt:/etc/letsencrypt

networks:
  npm-network:
    external: true

volumes:
  npm-data:
    external: true
  npm-letsencrypt:
    external: true