Attach anything(even other tokens and their attached elements aswell) to tokens, so that they move when the token moves and rotate/move when the token rotates. Resizing the base token will also resize all attached elements.
Baileywiki created a great showcase and tutorial video for the 4.0 release. I recommend it if you're updating from 3.x to 4.0 or if you haven't yet used Token Attacher at all: https://www.youtube.com/watch?v=2i0TX0BS8Vg
For more information see the github readme at: https://github.com/KayelGee/token-attacher/blob/master/README.md