I believe I’ve found a bug in the Aseprite v1.3 Beta tileset mode.
In the tileset (not the tilemap), I am unable to copy a tile and paste it to a new tile index. It looks like the copy part is working, because ctrl+c shows the tile selected with the moving border, but then selecting another tile (even a blank one) and pasting does nothing. I’ve tried doing this on all 3 tile modes.
I was speaking with Adam and he said he’s able to do it fine, so something is up. Not sure what’s wrong so unsure how to reproduce.