This section enables you to change the Skeletal Mesh used for previewing.
Preview Mesh (Animation)
The Skeletal Mesh to use for previewing.
Each type of asset, whether it's an Animation Sequence, Animation Blueprint, or a Skeleton can store and be overriden with different Preview Meshes.
The order of overriding goes from Skeleton to Asset, so if an asset doesn't have an override, it defaults to the Skeleton's Preview Mesh.