Like the following image I cannot combine bones at my model:
I just used armature-human(meta rig) but it seems doesn't work. When I imported it to UE4, I couldn't apply motions to my model. How can I fix it?
You have to connect armature with the skin (model). Here is the easiest way:
This will add armature modifier to your model and automaticaly create weights for each bone as vertex groups. Also it will set armature as parent of the model.