How does this “Concentric corner” thing work? it doesn’t work with frmaes/stacks ? The selection of sketch layers appears unusual to me. Why not drag to select all items in a frame?
Hi there. 
The way to use this is to apply the Auto corner on the child layer or layers, and then adjust the parent. Doing this will make the child layer dynamically adapt to the parent, based on the parent’s corner setting, and the child’s position in relation to the parent corners/edge.
Here’s a quick demo…
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Ohh got it 