In my case, there are no morphs, so it is safe to just save as a smart prop, but it did not allow me to save it as a prop. When I select the hair, I don't get the add button in my prop library. I can save it as a figure, and it retains the parameter settings, but does not automatically reparent to Hiro. Not the worst, but I don't understand why it won't let me save as a smart prop.

Thank you both so much for your help!

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