Mask mesh object with a sprite?

Hi.

I have a mesh object and a sprite object (Sprite Renderer) in the Scene. Now I'm trying to make the sprite as the mask object, so the mesh is seen in the sprite.

I tried this:

https://answers.unity.com/questions/610564/depath-masking-of-sprites.html

He says, that it worked for him. But it's not working.