Trouble with "refine tween" for a motion tween on Camera layer. Can only select X property curve.

Hello everyone! When I try to "refine tween" of a Camera layer's motion tween in Adobe Animate, the only property curve I can select is the X axis. The Y axis, depth, Z, etc. are all un-clickable. This is not the case for other layers. Any ideas why I'm running into this issue? Thanks!!!

\