SOLVED: Libraries

[soodoenim]

Ah.  Its ext4.  Good.  I had assumed it was NTFS or something.  We can just remove the ACL instead and use basic linux permissions.

Code:

sudo setfacl -b -R /media/littlebox
sudo chmod 755 /media/littlebox
sudo find "/media/littlebox/Big Box 2" -type d -exec chmod 755 {} \;
sudo find "/media/littlebox/Big Box 2" -type f -exec chmod 644 {} \;

This SHOULD set the permissions open enough for Jellyfin to read everything in Big Box 2.

That worked!