Sorry about that. I didn’t know what questions to ask and I didn’t know what to look for. I’m still a bit confused, but it’s getting clearer. From what I can tell so far, my Rigify rig works fine. Vertex weights work fine. But if I push the “Build Skeleton” button, everything stops working. For some reason the bone’s “Deform” property gets turned off. At least, that’s the only thing I’ve found that seems to explain my issue. Maybe I’m not setting up the UEfy parameters correctly. I feel like I have followed the tutorials rather closely. The only difference I’ve seen was the “Preprocess” button under Preprocess Modifiers doesn’t exist in my version of UEfy. I really appreciate your help in this.