how to edit a generated mask?

New Here ,

Hello , I am a noob still in Substance so forgive me if this is a trivial question but how do I edit a mask after I applied a generator and it clearly shows visible seams where uvmaps collide?

The mask when I select it seems to allow me to hae the paint curor but doesn't allow me to paint anything on it or edit it ... Is there something I am missing?

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Baking , Discussion