Not able to change login screen background image in gnome3 - solaris

We are trying to change login screen background image on gnome3(OS: solaris 11.4), But not working.
I have tried below steps,
# vi /etc/dconf/db/gdm.d/00-login
[org/gnome/desktop/background]
picture-uri='file:///opt/newbackground.jpg'
After this I have tried rebooting also, But still no luck.
Am not sure if am missing something here
OS: Solaris 11.4
TIA

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