Forget about Portainer, I use this simple tool to manage all my Docker containers on my NAS
I use Dockge to manage all my Docker containers, and I won't look back (except in some instances).

I've been hosting a lot of services on my NAS for over a year at this point, and I've played around with a lot of software to manage the Docker containers that I host on it. While I had settled on Portainer for quite a while, I recently played around with Cockpit and Podman when I turned my Steam Deck into a server. After that, I thought about Portainer alternatives, and I ended up trying out Dockge. While it's not as feature-rich as Portainer, what I found was a container management tool that meets my needs without any of the extra fluff.