I want to have a path animation first, then add some animation onto it.So in sceneanimate2 node,I add an animation Layer,and Clip name on sceneaddanimation I set to "anim1".Here's the problem.I would change path(curve) during keying,but animation is not updated when I modify the path,I found if I change Clip Name on sceneaddanimation("anim2") ,the path animation update.In rig tree there is "anim1" "anim2".But in my new animation Layer,I can't modify my animation curve,it says:

Traceback (most recent call last):
File "C:\PROGRA~1/SIDEEF~1/HOUDIN~1.587/packages/apex/viewer_states\apexanimate.py", line 1540, in _handleFinishedChannelsChanged
self._handleChannelsChanged(channel_names, collection_name, True)
File "C:\PROGRA~1/SIDEEF~1/HOUDIN~1.587/packages/apex/viewer_states\apexanimate.py", line 1555, in _handleChannelsChanged
if geo.isReadOnly():
^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'isReadOnly'

BaseLayer is ok,but new layer fails.
Any Help please

It's currently not possible in H20.5 to propagate animation across multiple nodes. The APEX Scene Animate makes a copy of the input animation and will store it inside the node. So if you change the animation upstream, it won't propagate downstream.