(err_cannot_create_subdir). Permission denied (code: 13) Help Please

urbackup is installed on Docker. Docker volume settings
Host/volume : /media/backups
Path in container: /backups
I mounted the /media/backups path to the space I shared on the nas server.
I authorized the /media/backups folder path as user urbackup group urbackup and gave permission to the folder as chmod 777.

From the Urbackup server settings, I set the path to save backups as /backups.

Regardless (err_cannot_create_subdir). I am getting Permission denied (code: 13) error.

My configuration settings are as above and I could not solve the problem. Help please.