Hi @Yun-Kun, thanks!
Foliage Actor is not supported, currently there’re 3 explict non-supported actor class: Group Actor, BSP Brush and Landscape, since those actors have special logic embed in core unreal editor which is hard to support without touching engine code. Foliages mostly works on Langscape and BSP hences is not supported.
I plan to put Preab Tool on itch this weekend.