If one deploys a simple Manipulate containing a 3D graphic to the cloud as in
CloudDeploy[Manipulate[Plot3D[Sin[x y+a],{x,0,3},{y,0,3}],{a,0,1}]]
the resulting hosted cloud interactive object does not allow one to interactively rotate the contained graphic with the mouse as one would be able to do in a Notebook.
In contrast simply Cloud deploying the graph does permit this as in
CloudDeploy[Plot3D[Sin[x y+3],{x,0,3},{y,0,3}]]
Is there a clear reason for this difference in functionality? Or is it a bug or "coming feature"?