@jju875
いくつかのリンク(Blend Poses by enumで検索)
Animation Blueprint Blend Nodes in Unreal Engine
UE4 アニメーションの切り替えを列挙型(Enum)で行う - Let's Enjoy Unreal Engine
Blend Poses (Enum) should have pins by default - forums.unrealengine.com
Question about Blend Poses by Enum - reddit