I’m not sure, but to me it seems that the “attach-bone” is used to calculate the position when using the traversal system. Without it, it won’t work.
And it needs to be placed correctly on the skeleton for it to work as intended.
I might be wrong, but that’s my conclusion after experimenting with it for a while.
I won’t build my whole game on the GASP project, and be forced to have the UEFN character and then retarget-system.
So I need to figure out how to work around that 