To create a new tile asset that can be used within a tile palette we must first copy/create a tile asset. It is okay to copy a pre-existing one as all tile assets are tied to the same script. For this ...

Note, in unity 2022, TextureImporter.spritesheet is deprecated, however it will work with warning. If you have a spritesheet like this: And when you drag it into a tile palette, it then looks like ...