I was trying to edit some textures with transparency to Photoshop by making Layer0  transparent. 1) In the Paint room select Layer 0 and Make Transparent. 2) Select Layer 1 and fill it with some shapes or brush strokes with hard alpha. 3)  Edit All Layers in Ext. Editor (Ctrl+P)   Using 3d-coat v4.5.03: In Photoshop (added white solid layer under the green shape to see more clearly) Looks like everything is fine.   And now using v4.9.68