Custom icon of folder on network drive missing from Favourites Bar and Folder Tree

I have set a custom icon for a folder on my PC which is available to my laptop via a network drive. The custom icon appears on my laptop in File Explorer and even in Dopus in listers, however, when I add the folder to my favourites, it does not appear in the Favourites Bar or in the Folder Tree.

This is what it looks like in Dopus:

And this what it looks like in File Explorer:

Which method have you used to customize the folder icons?

(The usual way that would affect Explorer as well, via the Properties dialog's Customize tab, isn't normally available on network folders.)

That is the way I have done it. Is there another way?

How did you do it that way? The "Customize > Change Icon" option is not present on network drives for me.

(Note that this is part of Windows, not part of Opus. We don't control when the option appears, or anything within the Properties dialogs.)