I'm making animation with a single bone for UE4. The motion path is showing when I animate an object in Object Mode but not in pose mode. Is there any way to display the motion path of a bone in Pose Mode?
Use the Calculate available in Pose Menu.
With a pose bone or bones selected in pose mode, go to
Pose > Motion Paths > Calculate
Or as mentioned by @FFeller in the Armature (DATA) Motion Paths panel.