2D PSD Character does not show layers in Sprite Editor

Hi, after a long time doing other projects I am coming back to rig and animate a 2D PSD File with a simple girl character in Unity. It is already set to 2D Sprite and Multiple.

The issue I am facing is, that if I click on slice (Automatic - safe) and then go to the Skinning Editor, I cannot see the layers I made in photoshop. There is only one big category button which says “bones”. I dont know how to select the different layers and how to assign them to the bones I created. I cannot find help in tutorials and other ressources.