Adding layers in a Group

So recently I found out that there is a way to place layers at the bottom of the group. This is done by holding the shift key while dropping a layer in the group. I was very excited to use this as I like to categorize all layers. So there is an issue when I duplicate a layer from the layers panel, using alt-drag and when I also use shift and leave in a group it doesn't leave it a the bottom of the group.