I use SW2017. I render my model. I use a metal surface, a std appearance file PAINT CAR etc. I have slightly changed color and illuminance, and saved my custom appearance file in a separate folder, with own name.
Now I like to change the colour a bit: I change, I save appearance file with same name.
I expected that all other (many) surfaces referring to same appearance file would change. They do not.
In fact if I delete my appearance file, all surfaces are unaffected.
How can I change all surfaces with this appearance file just in one action?