Nextcloud needs a heaping helping of a disclaimer before anyone installs it.
Use the Docker or Podman images, they'll include most things a lot of first time users leave out that render Nextcloud buggy and inconsistent. It includes a cache, and about half of the security issues preconfigured out of the box.
Installing it native from a guide with zero explanation beyond "welp, there's the start page" as the final step really doesn't do much for people and there's a lot of guides out there like that for Nextcloud.