CIFS Documents Provider

F-Droid Link
Open Source (MIT) mobile app on F-Droid for mapping network drives on Android. Since GrapheneOS does not support root, and normal root file explorers require root for network mapping, this bypasses that requirement. It lets the default file browser have CIFS "plugin" functionality to access files on network shares.

Works well with Tailscale for remote access to self-hosted file servers.