Hi @Alexa_Schehrer,
When you parent (attach) a camera to an item it automatically changes to the 'Fixed' movement mode, and right now there are no blocks that allow you to change the camera mode. Creating a ‘mount up / dismount’ behavior is tricky with those limitations.
However, we have a change camera - block in the works which will be released with our next update in the next few weeks. That block will help you achieve the correct behavior 
.
Check out this thread to preview the block!