I recently followed this video and ran into some issues myself, so I'm going to add what got things working for me.
I was getting the following error when trying to open a document: "Unauthorized WOPI host. Please try again later and report to your administrator if the issue persists."
If found this fix on a reddit thread. Navigate to the Docker tab in Unraid > Collarbora (open the configuration for the container) > Domain:
change the domain from "yoursubdomain\\.example\\.com" to "yoursubdomain.example.com"
After I changed this I was abl
