Hello @zackwhaley
This is not our app. Please check this post: Community Document Server app in Nextcloud 18
Community Document server is a fork of old version of Document server. I believe you have to contact Nextcloud team about this app.
Our official connector in Nextcloud App Store:
https://apps.nextcloud.com/apps/onlyoffice
Our official guides for Document server installation: Installation Guides - Docs - ONLYOFFICE