I would suggest to put your nodebb behind nginx, and have a location block matching static content use a proxy_pass directive pointing to your static server.
Use this as reference: https://nodebb.readthedocs.io/en/latest/scaling/index.html#use-a-proxy-server-to-serve-static-assets
And adjust it to have a proxy_pass http://static.example.com; instead of searching the local filesystem (ie, replace root and try_file directives) under the static content location block.
I believe this should work
I know there are two default groups, the name is administrator and global moderators (group system) but I do not accidentally delete a group global moderators (it should not be removed) how to I get it back ?
*Sorry if my grammar is bad