I’m having the same issue, I apply a preview mesh to skeleton asset, opening an animation asset seems to overwrite and pick a skeletal mesh at random. If I delete the skeletal mesh it’s defaulting to it picks another one at random. If I save the skeleton with the preview mesh I want applied, then close the editor, when I open the editor again, it wants me to apply the mesh to the asset again (the correct mesh is still shown in the picker, but the “Apply to Asset” button is back), and all animation assets are showing the random skeletal mesh again. Hope to hear an answer soon