Hi spongerob,
support for ExFat is not installed by default on RuneAudio.
You have to do the following:
- connect to your Pi using SSH.
- If you are not familiar this SSH read this for Windows or this for Linux/MacOS
The default login for RuneAudio is "root" with the password "rune" (without quotes).
- install the missing package.
pacman -S fuse-exfat
- reboot from console or from UI.
reboot
- enjoy your music
Frank