making an Anim BP to recieve streaming Optitrack data from Motive you add an Optitrack Skeleton node
Dragging off from the Source Skeleton Asset Name or the Streaming Client Origin to quckly create a variable of the correct type (which is common practice in Unreal development) creates a variable but then the animation BP won't work.
instead you need to search for and add the correct variable type from the list.}
this is a bug which has been around for ever here's an image from Unreal 4.27 the 5.3 version looks very similar.
