Just start it! It creates a 3D effect of the Sprite! The Change Sprite button changes the Sprite.
I got a challenge to make a 3D Sprite, The rules were that I keep its color. Note 1: heart face may not work by sprite change scripts, restart the project. Note 2: After debugging, I found out it had to do with how it was rendered, While I don't know how to fix this, You can only change the character once.