synapse/docs/systemd-with-workers/workers/media_worker.yaml

worker_app: synapse.app.media_repository
worker_name: media_worker

# The replication listener on the main synapse process.
worker_replication_host: 127.0.0.1
worker_replication_http_port: 9093

worker_listeners:
  - type: http
    port: 8085
    x_forwarded: true
    resources:
      - names: [media]

worker_log_config: /etc/matrix-synapse/media-worker-log.yaml