Another "Document Loading Failed" Post

Couldn’t find any helpful solutions while crawling google and the forums, any help would be appreciated.

I have setup LAMP stack and Nextcloud base don these two documents:
https://www.linuxbabe.com/ubuntu/install-lamp-stack-ubuntu-20-04-server-desktop
https://www.linuxbabe.com/ubuntu/install-nextcloud-ubuntu-20-04-apache-lamp-stack

I gave Nextcloud an SSL Cert based on this article:

I have my system working up to this point, using an NFS Mount from my NAS as the main Data storage, and a Samba Share loaded as “External Storage”

I installed Collabora based on this article:
https://www.linuxbabe.com/cloud-storage/integrate-collabora-online-server-nextcloud-ubuntu

In Nextcloud Settings, for “Office” I have a green Checkmark and it says “Collabora Online Server is reachable”

But when I try loading a file, I just get the “Document Loading Failed. Failed to load Nextcloud Office - Please try again later.”

Any suggestions?