Pydio Cells with Collabora/Code using NGINX Proxy Manager

Pydio Cells
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As a followup from this video tutorial (German) Collabora Online (Nextcloud Office) Code Server Docker Container Installation inkl. Reverse Proxy
I added a NGINX PM rule to see if this worked. What it did was redirect to my WAN IP which I needed to open a port on the router to resolve properly. But I still get the blank white page when opening a doc in PC.

I’m now thinking I have 2 issues 1) incorrect proxy settings 2) incorrect app settings.

####### Nginx Proxy Manager config #######
1. Create your new Proxy Host, specify https protocol and the server host/ip and port 9980. Also enable Websockets Support.
2. On the SSL tab select a new certificate, enable HTTP/2.
3. On the Advanced tab, enter:
# static files
location ^~ /loleaflet {
  proxy_pass $forward_scheme://$server:$port;
  proxy_set_header Host $http_host;
}
# WOPI discovery URL
location ^~ /hosting/discovery {
  proxy_pass $forward_scheme://$server:$port;
  proxy_set_header Host $http_host;
}
# main websocket
location ~ ^/lool/(.*)/ws$ {
  proxy_set_header Upgrade $http_upgrade;
  proxy_set_header Connection "upgrade";
  proxy_http_version 1.1;
  proxy_pass $forward_scheme://$server:$port;
  proxy_set_header Host $http_host;
  proxy_read_timeout 36000s;
}
# download, presentation and image upload
location ~ ^/lool {
  proxy_pass $forward_scheme://$server:$port;
  proxy_set_header Host $http_host;
}
# Admin Console websocket
location ^~ /lool/adminws {
  proxy_set_header Upgrade $http_upgrade;
  proxy_set_header Connection "upgrade";
  proxy_http_version 1.1;
  proxy_pass $forward_scheme://$server:$port;
  proxy_set_header Host $http_host;
  proxy_read_timeout 36000s;
}