2D Animation Package png How to drag into the scene

I dragged the Rikr png in the sample into the scene, but the bone structure cannot appear as in the official blog. What is the reason?

2d animation package version:3.1.1 and 5.0.1

6341649--704574--2020-09-24_02-33-02.gif

You’ll need to add a Sprite Skin component to the Rikr png sprites to generate bones. If you want to be able to drag in a character and have it rigged with bones, you’d need to use a psb (like the Fei sample).

Well, I have switched to psb