I would just mount the NAS folders via Samba into the NUC. Problem is that services can’t watch the filesystem for changes. If I add a video to my Jellyfin directory, Jellyfin won’t automatically initiate a scan.
That sounds like a config issue. I use NFS shares in a similar way, and Plex/*arr/etc has zero issues watching for changes.
Portainer is way too bloated for personal use. I liked it initially, but the licensing shit was, well, shit, and the way it managed compose files was garbage. Dockge is way better for my use case, since it works alongside Docker, instead of fucking off to do its own thing.