Do I need to publish ONLYOFFICE Document Server to work with documents in Owncloud?

Good afternoon,
there is a cloud published on the Internet Owncloud

additionally installed ONLYOFFICE Document server to open word-, excel- documents in the browser.

Question: ONLYOFFICE Document server is enough to deploy in the Owncloud local area network or do I need to publish it also on the Internet?

As far as I know the ONLYOFFICE server also needs to be published as the document is being loaded as an iFrame inside ownCloud.

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As eneubauer already wrote, the port 443 (or 80 respectively) must be open, so remote users can connect to the document server. A full list is provided in the onlyoffice docs: