/3/ - 3DCG

So I made a model in zbrush, its for a videogame

> I need to rig it, so Im using Maya.
>Now Im going to need Blendshapes, or layers, or just morphs for making the model smile, close eyes and such.
>Im going to use Zbrush again for that, (some morphs only appear after using the skeleton and posing the character)

Here is the problem. If I import the FBX with the skeleton back to zbrush, my skeleton disappears. Its gone.
Which is the correct workflow for this? I dont have any idea.