Hello. Newbie here, but been using the game for about a year or so.
I really want to make a custom map that has a land mass that is shaped like an upside-down U, with a large mass of water filling a central basin, and several peninsular type spurs coming off the land mass at various points, and I have tried several times to do this but the game never seems to find the PNG files I create and allow me to use them.
Does anyone here have any pointers for an area that I may have got wrong? I have done my best to follow the instructions from several sources that tell me that a grayscale PNG file made to the right size should work.