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I read that Linked layers are just like Smart Objects in Photoshop. And it is supposed to be available in 3.0.

Does 2.99.12 have this feature? I am not sure where to find it or use it. Thanks.

As far as I know, going to be a new layer type, linked layers https://youtu.be/N5oyqbD7zyQ

Nothing that I can see in Gimp 2.99.12

Can't find it either. The big change in 2.10 is that instead of using chain-links, you can select multiple layers.

There is an open feature request on gitlab about non-destructive editing and smart object : https://gitlab.gnome.org/GNOME/gimp/-/issues/2468
It has been set to milestone 3.2 but this can changed ...