Folder is not writeable by user abc

Sonarr version (exact version):
Mono version (if Sonarr is not running on Windows):
OS: Docker on Ubuntu 22.04
Debug logs: see below
Description of issue:
Unable to add root folder

Folder is not writable by user abc

In the log it says the same

root TV folder within docker
rwxrwxrwx+ 208 1001 abc 0 Jul 28 14:08 tv

folder within TV of Docker
drwxrwxrwx+ 8 1001 abc 0 Jul 28 14:32 ‘serie1’
drwxrwx—+ 11 1001 abc 0 Feb 16 2020 serie2
drwxrwxrwx+ 9 1001 abc 0 Feb 19 2018 ‘serie3’

using linuxserver docker image with PUID 1000 and PGID 1000

Outside Docker the PUID and PGID have write access to said network share.

You have ACLs (+) which complicate permissions and are rather advanced and the user and group you are running lidarr as does not have RW permissions to the folder.

the problem from how I see is in the container.
outside docker both UID 1000 and 1001 even for that matter have 775 permissions to the NAS.

ACLs are an additional highly complex layer of permissions on top of regular *nix permissions

strange I have no ACL defined in my fstab concerning my mounted drives.

my fstab

// /mnt/share3 cifs credentials=/home/user/.smbcredentials,iocharset=utf8,vers=1.0,file_mode=0770,dir_mode=0770 0 0

it’s ACL on the filesystem…don’t believe the fstab has nothing to do with it

all I get from the getfacl is this

getfacl /mnt/share3/Series/abc/fanart.jpg
getfacl: Removing leading '/' from absolute path names
# file: mnt/share3/Series/abc/fanart.jpg
# owner: user
# group: group

I don’t see any extended acl info which you would expect