How can I make an Actor with HISMs allow mantling?

I have been building a level using HISM (hierarchical instanced static mesh) as suggested for optimizing the use of many instances of static mesh. I’ve learned from testing that you cannot simply create an Actor, add the HISM component, and then mantle. If I use an instance of the static mesh straight from the content browser, it can be mantled. Using the Actor and HISM, it cannot be mantled. Is there a simple component or setting that allows this basic Actor to be mantled?

Thanks for the help!!