Maybe i'm not quite understanding what this tool is.
The issue I have with ACNH is that the animations of terraforming are so slow, it is painful to create cliffs and rivers on an island because of them.
Does this tool allow me to create an island, and upload and APPLY the changes to my animal crossing island on my switch? Or, is this essentially a tool where you can design an island, then have to manually copy it tile-by-tile on to your island on your switch by following along as I play my switch?
Thanks for any clarification