The next release of TrueNAS SCALE in October is dropping Kubernetes in favour of plain Docker/Docker Compose. That may be worth a look?

That’s good to hear. Looks like something worth revisiting once it’s been tested well.

I would have used Owncloud Infinite Scale but the fact you can’t use your own existing files makes it a complete non-starter for me. I don’t want my files locked behind Decomposed FS.

Unless I’ve read things wrong, which is entirely possible.