I am trying to make a pig riding mechanism that looks something like the one of the right. 
This is how im programming my mounting event. I’ve added a Play Montage but it might not be necessary, I added it in a desperate attempt just in case… after having many failed attempts with the default animation asset detail. 
Here’s the default animation asset that the skeleton is playing by default:
It looks like it works just fine in the editor but not during runtime. 
Edit: (Also I just now realized that it also works when I make these other skeletal meshes visible, so I suspect it might be due to the skeletal mesh issue not working with my current character mesh properly.)
Here you can see the fingers and arms being rotated the opposite direction. Instead of being rotated in front of the body, they’re rotated behind the body. Instead of the fingers curling inwards, they curl outwards. And same for the legs:
Note: The animation is only a 150 frame sequence/montage but there’s no animation. I basically made it frozen in this frame, there’s no movement. 150 frames of the same frame.
I suspect it could be due my current skeletal mesh not being configured properly, but im not sure yet how I will configure it specifically for this 1-frame animation.