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I have no clue why, but the stacked layers are not working for me one bit. I am trying to make a label for a bottle, using an opacity mask. Currently, for testing purposes I'm only using a single layer. All I need to do is place a black and white map into the Opacity/Mask box for this to work, correct? That's what the manual seems to suggest but it is most definitely not working for me.

Is there a bug, or am I missing some weird step or something? Thanks for any help on this very basic question.

Yes, you describe the correct usage. Could you share the material or show screenshots to see what is failing?