I don’t think more apps is what Umbrel really needs. Why people want to run their cloud storage app on the same hardware as their Bitcoin and Lightning node is puzzling to me. A lot of the web apps available on Umbrel are really complex pieces of software. Vulnerabilities in something like Nextcloud is almost guaranteed to exist and a compromise there could jeopardize your sats. Just saying.

You can of course just run a version of Umbrel on a different system without installing the Bitcoin + Lightning node apps though if all you want is a front end for docker.