The original filebrowser (github.com/filebrowser/filebrowser) has been archived for a while now, and Nextcloud is way too bloated for just browsing and sharing files on a disk.
So I made my own replacement. It's still early so expect some rough edges and bugs, but I've been daily-driving it on my setup and it gets the job done.
Repo: https://github.com/skidoodle/filebrowser