I got a tileset at Itch.io and started a project but I have no idea how to set this tileset on autotile. I tried the default bitmasks that I found on the internet but none of them worked well.
This is an excellent tutorial on Godot TileSet/TileMap. However I was using Godot 3.2 when I did the tutorial, and am not sure if it's compatible with Godot 3.5. https://www.davidepesce.com/2019/10/18/godot-tutorial-7-using-tile-maps-to-create-game-map/
DaveTheCoder Thanks!