Docker and transmition folder relocation to external drive

Hello I was having an issue with docker and how to set up transmission on a raspberry pi 3. I want transmission to store the downloaded files and the watch folder on a USBdrive I thought I could make a symbolic link from /home/docker/transmission/downloads to my share /dev/sdd1/movies/download but that didn't work was wondering if I can add the share to docker or a symbolic link to the root drive to redirect the files.

<mntentref>a6cb1762-e869-4420-87c4-492ec8046286</mntentref>

<reldirpath>/home</reldirpath>

<privileges></privileges>

</sharedfolder>

<sharedfolder>

<uuid>50db7bab-10c2-4572-a5f8-1fae03c97e57</uuid>

here is the code from my failed attempts

root@home:/media# nano /etc/openmediavault/config.xml

root@home:/media# sudo docker create --name=transmission \

> --restart=always \

> -v /home/docker/transmission/config:/config \

> -v /dev/disk/by-label/Iron/Movies/download:/downloads \

> -v /dev/disk/by-label/Iron/Movies/watch:/watch \

> -e PGID=1001 -e PUID=1001 \

> -e TZ=America/Los_Angeles \

> -p 9091:4221 -p 51413:51413 \

> -p 51413:51413/udp \

> linuxserver/transmission

Unable to find image 'linuxserver/transmission:latest' locally

latest: Pulling from linuxserver/transmission

cb1cd524088f: Pull complete

d255b3f33366: Pull complete

b68062b0e773: Pull complete

5f5f6f887bc6: Pull complete

097a2fb7061e: Pull complete

Digest: sha256:26dbfe004778050793f98bd153806a08a0c46d69faee7b6768f2067c4af36f64

Status: Downloaded newer image for linuxserver/transmission:latest

c119e451258a6e154d3e2aed18b8033cc5f008c75c1712a1d663e8bda13c926b

root@home:/media# docker start transmission

Error response from daemon: OCI runtime create failed: container_linux.go:349: starting container process caused "process_linux.go:449: container init caused \"rootfs_linux.go:58: mounting \\\"/dev/disk/by-label/Iron/Movies/download\\\" to rootfs \\\"/var/lib/docker/overlay2/b6298222f4430b87906156f9e0847a9217a27e371c4977051d929d6312cc69d2/merged\\\" at \\\"/downloads\\\" caused \\\"stat /dev/disk/by-label/Iron/Movies/download: not a directory\\\"\"": unknown: Are you trying to mount a directory onto a file (or vice-versa)? Check if the specified host path exists and is the expected type

Error: failed to start containers: transmission

root@home:/media#