u/RizDub

I'm making a simple vtuber model that has a ghostlike tail. I used this tutorial to rig the tail, but when I do that it stops warping with the rest of the body (which is a separate layer). At first I thought it was because I animated the warps for the Body X/Y and Breath parameters before making the tail, but even after deleting those warps and redoing the tail it still detaches. Why does it do this? Do I need to combine the body and tail layers in the .psd to prevent this, or is there some other way I can fix this?

https://i.redd.it/6cwq54o64jbh1.gif