In future, please post technical questions and issues in Technical Q&A.
The camera object vanishes because you are referencing a scene object from an asset - meaning the asset is not able to "find" the object at all times.
AC works around this by assigning Constant ID numbers to the scene objects - see the "Recorded Constant ID" box beneath the field in the Action. Once assigned, you must save the scene to make sure the object keeps the ID number, which is done by adding a Constant ID component to it.
For more on this workflow, see the chapter on "ActionList assets" in the Manual.
Comments
The camera object vanishes because you are referencing a scene object from an asset - meaning the asset is not able to "find" the object at all times.
AC works around this by assigning Constant ID numbers to the scene objects - see the "Recorded Constant ID" box beneath the field in the Action. Once assigned, you must save the scene to make sure the object keeps the ID number, which is done by adding a Constant ID component to it.
For more on this workflow, see the chapter on "ActionList assets" in the Manual.