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Re-Edit Mask
It’s a simple thing but it has been cursing me.
How can I re-add points into an mask?
No, I am not talking about re add points IN the mask, what I want to ask is how can I re-add pointss TO the mask after I un-selected it, and it is not closed yet.The way I did was, press Command+Z ( Mac ) and it would take out one point and then I was able to add points again.
Like this:

The Problem now is that I closed the project, and I need to keep building the mask.
How can I add new points to it?
Remeber: Not IN it.