How to add something to a layer in illustrator

- How to add color to a layer in illustrator
- How to add a layer in illustrator
- How to add an object to a layer in illustrator
- Illustrator add new layer'
- How to add a layer in adobe illustrator
- How to add an image to a layer in illustrator
- How to add a background layer in illustrator
- How to add a threshold layer in illustrator
- How to add a layer mask in illustrator
- How to add a multiply layer in illustrator