Hi ! And thanks for the video because I know what is the issue now !
The doc is wrong I just noticed, you need to only restart php node and nginx after a configuration change.
Why ? Because the database is very slow to start and node thinks it was not started at all (node is used only for channels on this version).
The solution is to do this command as soon as the page goes from waiting from db to the login form: docker-compose restart node php nginx
If everything is stopped you can also do this (start db, wait 2 minutes, start everything else): docker-compose up -d scylladb; sleep 120; docker-compose up -d