Documents not opening

Failed to load Collabora Online - please try again later

Not all. PDF files seem to work but no other template docs working that I can tell.

Invoice for example not working.
Seems to be ods and .odt files not working.

I noticed this in the settings area:
I don’t know if I’m suppose to configure something further or if defaults are suppose to be enabled or just working somehow.

Collabora Online settings show “X”

“Could not establish connection to the Collabora Online server.”

“Use your own server”

I don’t understand this feature of if there is something I am suppose to do.
These documents included in nextcloud by default suggest I should be able to open and view them ? Is this NOT how it works by default ?

Please advise