Can you unlink the decal on a copied object so changes to the copied decal don’t change the original?
purge your history and you can update the decals independently
I copied the object. Typed in HistoryPurge. Was prompted to select object or all. I was unable to select the copy or the original so I selected all. When I changed copy decal, original changed.
FYI I haven’t been using history
are you using the decal widget to edit the decal?
after using widget to apply to the original I simply change the map file for the copy