Need help for simple OCIS/Onlyoffice docker-compose

Infinite Scale
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1

Hello,
For a while now I’ve been trying unsuccessfully to create a docker-compose file allowing the deployment of an OCIS instance with Onlyoffice integration without Traeffic. I’ve managed to make each of the necessary elements work separately (OCIS/Wopi/Onlyoffice) but I’m stuck on how to group them together via an app-provider container.
Please find below my docker-compose file as is:

volumes:
  ocis-config:
  ocis-data:
  onlyoffice-data:

networks:
  ocis-net:

services:
  ocis:
    container_name: owncloud.ocis
    image: owncloud/ocis:latest
    restart: always
    volumes:
      - "ocis-config:/etc/ocis"
      - "ocis-data:/var/lib/ocis"
    networks:
      - ocis-net
    ports:
      - 9200:9200
    environment:
      OCIS_INSECURE: "true"
      OCIS_URL: "https://owncloud.exemple.eu"
      OCIS_LOG_LEVEL: info

  onlyoffice:
    container_name: owncloud.onlyoffice
    image: onlyoffice/documentserver:latest
    restart: always
    volumes:
      - "onlyoffice-data:/onlyoffice"
    networks:
      - ocis-net
    ports:
      - "8080:80"
    environment:
      WOPI_SERVER_ENABLED: "true"
      ONLYOFFICE_DOMAIN: "onlyoffice.exemple.eu"

  wopiserver:
    container_name: owncloud.wopi
    image: cs3org/wopiserver:latest
    networks:
      - ocis-net
    environment:
      WOPISECRET: LALALASECRETLALALA
      WOPISERVER_DOMAIN: wopi.exemple.eu
    ports:
      - "8081:8880"
    restart: always

OCIS, Wopi and Onlyoffice respond on assigned domains.
I don’t want to use Traeffik, I have a Synology NAS and use its reverse proxy.

Thanks in advance for your help.