Keepass2Android/KeepassDX with Nextcloud? I don't understand how running Minio with a custom built webdav server is easier than Nextcloud has integrated WebDAV access.
I used to run Nextcloud. Nextcloud did a bunch of stuff I didn't need, is a larger attack vector and usually took an entire afternoon/evening every time I needed to do an upgrade. So far I spent less time setting all this up, and writing a WebDAV server than any one upgrade of Nextcloud took me.
Minio is zero-maintenance, if it needs an upgrade I just pull a newer Docker image. My WebDAV server is fewer than 100 lines of Go and extremely easy to maintain.
I run Nextcloud in a docker image (on unRaid). Upgrades are a docker pull away too, never had any issues.
I use Nextcloud on my phone (Android) to backup my camera too, the automatic sync is wonderful and works well. It does stuff I don't need too, but it's pretty easy to use and setup and it integrates well with the OS (Windows and Mac at least).
