Can't toggle handle mode on Asset Warp tool

[Ray35198197arvu]

I'm pretty new to animate, so not sure if this is a glitch or user error. I'm animating animal legs using asset warp tool. I created "bones" for each of the legs. The front legs are warping independently without affecting each other but I can't move one of the back legs without affecting/warping the other. I also can't toggle "handle mode" in the object settings, even with a joint selected. Is there another setting I need to turn on? Was it a drawing error? (Both of the back legs are separated in my drawing so I'm not sure why this would be the case). Thank you in advance for any help. 

[Mario_CR]

Handle mode is only enabled for warp pins without bones.

Doesn't seem that your legs are separated, the entire drawing is one single shape. Separate your drawing into parts, and put each part into separate layers, then use the asset warp tool on each part individually.