Hey. This is not working in CC3 as it screws over the mesh when it's sent back from Zbrush..as you already notice there are only A and T-pose and basically CC3 thinks you are sending a new mesh back or an accessory This problem is a bold pain in the ass as it's sometimes necessary to have the mouth open to tweak the skin, without this possibility you need to ping-pong the mesh back and forth 5 to 10 times with closed mouth and anticipate how much is needed to modify also the mesh is smoothed out in CC3 which is not possible to do in Zbrush as you can't modify the mesh before sending it back.. I wish someone could fix a lot of those small but so very annoying problems in these tools