Shared root of drive, upgraded, now shares broken

[LarsR]

according to this post

Filesystem permissions on path /mnt/MainPool prevent access for user "apps"

I have an SMB where I store my movies on which was created before I migrated from CORE to SCALE. Now, I am moving my Jellyfin to my server, so I set the docker up and mounted a folder which is inside the SMB dataset (/mnt/MainPool/SMBtest). However, Jellyfin can’t see any movies in the folder because it has no permissions. After adding user apps to the dataset, I get this error [EPERM] Filesystem permissions on path /mnt/MainPool prevent access for user “apps” to the path /mnt/MainPool/SMBtes…

yes it can be solved by chmod