Filter layers allow you to apply a filter in addition to using a mask to determine how much of the image will use the filter. We do not show the mask image though on the layer stack...just the final projection of the filter. We might have to discuss a bit how this would be done. Do we want to show the final result and the mask, or just one of them. Showing the mask would be nicer at times when selecting the grayscale color. It helps to know what to pick and what the mask currently looks like when coming back later. STEPS TO REPRODUCE 1. Create a filter layer with any effect OBSERVED RESULT Only the final filter result shown in the thumbnail. EXPECTED RESULT The mask is shown somewhere on the layer stack to show that a filter layer has a mask.