The service is installed on every Sipwise C5 system, but is not activated by default. In order to activate the service with default port 1446, connect with SSH to your server, open /etc/ngcp-config/config.yml with your editor of choice and change the fileshare.enable property from no to yes:

fileshare:
  enable: yes
  external_port: 1446

Apply the new configuration in the usual way:

ngcpcfg apply 'Enabled comx-fileshare-service'
ngcpcfg push all

and check the status with ngcp-service summary. It should be now up and running.