Drop the rule tile into the tile set. Then drag the sprites from the project folder into the inspect where the square says "Select."
An X is a hard edge. The Green arrow means it is continuous.
Creating an Animated Tileset
You'll need to create three different files in a different state of the animation.
Working File for animated water.
For making an ice path, these are the specifics:
Yes, I'll have to make the colliders for the water not blocking sections by hand, but at least the player will be able to walk onto the water paths and the rule tiles can be used.