Create user and group
---------------------
Credentials -> Local Users -> Add
Full Name: jellyfin
Username: jellyfin
Disable Password: <select>
Email: stuurmcp@telkomsa.net
UID: (note)
Create New Primary Group: <unselect>
Primary Group: jellyfin
Create Home Directory: <uncheck>
Samba Authentication: <uncheck>
Save

jellyfin UID: 3009
jellyfin GID: 3008

If not done already, add mapping for media on container config
--------------------------------------------------------------
In this example: the folder where media is stored is /mnt/stpool1/NData1/Media
On Truenas shell:
jlmkr edit docker
Add the following args to "systemd_nspawn_user_args": 
--bind='/mnt/stpool1/NData1/Media:/mnt/media'

If not done already, set ACL permissions for media to be accessible by media group
----------------------------------------------------------------------------------
On Truenas shell:
# read and note acl entries
getfacl /mnt/stpool1/NData1
getfacl /mnt/stpool1/NData1/Media
# set read and execute permissions for media group on parent folder
setfacl -m g:media:5 /mnt/stpool1/NData1
# set full permissions for media group on Media folder recursively
setfacl -R -m g:media:7 /mnt/stpool1/NData1/Media
# modify defaults recursively
setfacl -R -d -m g:media:7 /mnt/stpool1/NData1/Media
# NB! if you want to remove all acl entries from a folder recursively, use setfacl -b -R <foldername>

Create datasets
---------------
# In Truenas shell:
# list datasets
zfs list | grep -i "docker.*jellyfin"
# create following datasets if not present
zfs create SSD1/docker/data/jellyfin/config
zfs create SSD1/docker/data/jellyfin/transcodes
chown -R jellyfin:jellyfin /mnt/SSD1/docker/data/jellyfin

Create folders
--------------
# In Truenas shell:
mkdir -p /mnt/SSD1/docker/stacks/jellyfin/secrets

Copy folder to docker stacks
----------------------------
# In Windows cmd shell in jellyfin folder, enter:
./cp2nas
# or
pscp -P 22 -r stacks/*.* root@192.168.2.2:/mnt/SSD1/docker/stacks/jellyfin/
# This should copy jellyfin stacks folder to /mnt/SSD1/docker/stacks/jellyfin