So Nextcloud is running on my VPS using docker, nginx and other stuff.
Desktop → Browser → Nextcloud → Apps → Office & text → Collabora Online - Built-in CODE Server (ARM 64) is enabled.
I can open Desktop → Browser → Nextcloud → Files → Documents → Example.md and edit, however Welcome to Nextcloud Hub.docx shows error: Document loading failed. Failed to load Nextcloud Office - please try again later.
Seems like the domain name registrar DNS records are pointing Type: A Record, Host: office, Value: correct public IP of VPS, TTL: Automatic correctly. However Terminal: dig A office.url, shows ;; ANSWER SECTION: office.url 15 IN A wrongUrl.
I updated the domain registrar IP maybe 72 hours ago.