Track a particle emitter placed outside the device—like a world effect object—onto the hands

Hi Everyone! Quick question: How can I track a particle emitter placed outside the device—like a world effect object—onto the hands?

In the video you can see that when the camera is static, the particle system is influenced only by the hand’s movement. However, when the hand is static, the particles move when the camera pans from left to right as if the hand was accelerating, but the particles should remain static over the non-moving hand even if the camera moves around.

I’m guessing that the particle emitter should be placed outside the device as a world effect and then I should track that object to the hands, but I can’t seem to make it work. I would really appreciate it if you could point me in the right direction.

Cheers!