Php – Docker containers not using volumes

I think I do not understand how Docker volumes work. I have a docker compose file with an app service running a laravel app, a postgres service, and a memcached service. I have named volumes for the laravel storage and for postgres, but nothing is persisted to those volumes. If I look in my file finder there are no files in the folder and when I shut down the db container the data is lost.

docker-compose.yaml:

services:
  app:
    build:
      context: .
    entrypoint: php artisan octane:frankenphp
    ports:
      - "80:8000"
      - "443:443"
      - "443:443/udp" # HTTP/3
      - "5173:5173"
    depends_on:
      - db
      - cache
    volumes:
      - storage:/path/to/laravel/base/storage
      - ../:/app
    networks:
      - storefront
      - backroom
  db:
    image: postgres:latest
    restart: unless-stopped
    volumes:
      - data:/path/where/I/want/db/data
    environment:
      POSTGRES_USER: user
      POSTGRES_DB: db
      POSTGRES_PASSWORD: "password"
    networks:
      - backroom

  cache:
    image: memcached:latest
    restart: unless-stopped
    networks:
      - backroom

networks:
  storefront:
  backroom:

volumes:
  data:
  storage:

This line appears to work:

• ../:/app
  When I do things inside the app service container, I can see the changes in my local file system. For instance, if I use composer to add a package, I can look at composer.json in VS Code later and the new package is there. But the two named volumes do not appear to do anything.

The containers communicate – php artisan migrate and php artisan db:seed create tables and records in postgres – but the data does not persist.

Thank you