I appreciate the detailed walkthrough. I will try to replicate your steps above if I get a chance the next few days. Looks almost foolproof except for the constant container downloading that’s happening.
EDIT to add: one difference I noticed was the lack of a “raspberrypi4-homeassistant” container on my system where you have raspberrypi3-homeassistant. That’s a clue that not everything was installed and/or running correctly. Any insights on uninstalling all of the containers and starting from scratch? Will portainer help with that?