Is there a Terrain genius among us?

[Bongo]

I could really use some helpful advice for a terrain set I am trying to make work.

This is my set which are 64x64 tiles that I wish to use for autotiling(?) with a 2x2 tile block as seen in the snip next my tileset.

The objective here is create an output that is similar to what this set produces, but this set uses single 64x64 tiles.

I came close using mixed tiles, but I could only draw one color at a time.
Is what I am attempting even possible? Thanks for any input.

[eishiya]

This is not possible with Terrains. You should either use this as 128x128 tiles (assuming the current tile size is 64x64) like it’s meant to be used, or you should use Automapping.