Shape Key Issue


I have an issue when trying to create a shape key.

For some reason, when I raise the arm and try to edit the mess, I can never get rid of the crease.

In fact, when I try to move verts around the shoulder, they resist moving up and down.

Can someone give me some advice?

Thanks.

Attachments


use the corrective shape key add-on. it’s made to do just this.