Question Really confused about 2D sprite asset library and animation workflow

I've watched countless youtube videos but the problem seems to be they are all for earlier versions of unity and earlier animation/sprite asset library systems. I'm currently working with 2021.

1. I have sprites that have skeletal animations.
2. The sprites are similar and all the animations will use the same rigging/animation clips from Sprite 1.

Can someone give me a step by step instruction on how to make sure Sprites 2 and 3 are using the same rigging and animations from Sprite 1?

The videos I've watched vary from just copying and pasting the rig to creating a sprite asset library, but at that point they all start to differ in steps. I find the library confusing. In some videos the libraries will contain all the body parts of all the sprites, and in others each separate sprite will have their own library.

Then it comes to the issue of the rig and animation clips. Where does the rig go? How does it get copied from one sprite to another? I see one person using some rig component that doesn't seem like it exists in my version of Unity.

And then how do I set it up so those animation clips are played by the different sprites (all sharing the same rig?)

I've watched 6 videos by now from youtube (all the popular ones) and every time I follow one they seem to be different from the 2021 version of Unity.

Any help appreciated, thank you!

 

Ok, I found this step by step guide (should have looked at this first lol) and I'm following this but I don't understand where two initial libraries came from. There is no mention of how these were created.

https://docs.unity3d.com/Packages/com.unity.2d.animation@9.0/manual/ex-sprite-swap.html

"They are located in Assets/Samples/2D Animation/[X.Y.Z]/Samples/5 Sprite Swap/Sprite Library and are:"

Where did dialog.spriteLib and dialog gray.spriteLib actually COME from? The tutorial doesn't mention created them in the first place, as far as I can tell.