set ACL permissions for media folder to be accessible by media group
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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>