Bookorbit Library NAS help

I've been spinning up my BookOrbit and I cannot get it to see the folders in my /mnt directory no matter what I do. I have tried a number of configurations for the BOOK_HOST_PATH in the docker compose file. This is what it currently looks like ${BOOKS_HOST_PATH:-/mnt/synology/BookOrbit/Books}:/mnt/synology/BookOrbit/Books I've been working my way through courses on docker and linux, but I'm just not sure why it won't find the /mnt directory. The drive is mounted on my Debian 13 VM correctly. I can follow this path in the shell for the VM on proxmox and get a list of my books. I'm sure it is user error but it is just so frustrating. I wanted to do it in docker because everyone says that is better than using the community scripts when a docker option is available, but I'm at my wits end. If anyone can help I would appreciate it.