When you download a map-mod (a mod that has maps in it) and you dont have any previous maps in the map editor, the maps from the mod wont appear because the 'Custom Map' tab in New game screen doesnt appear.
It will only appear until you create a new map, then it will enavle to choose the maps.
This just happened today to mape in the discord in mod discussion.
Steps to reproduce:
Open Unciv without ever making a new mao, basically open unciv as it was the first time.
When you download a map-mod (a mod that has maps in it) and you dont have any previous maps in the map editor, the maps from the mod wont appear because the 'Custom Map' tab in New game screen doesnt appear. It will only appear until you create a new map, then it will enavle to choose the maps.
This just happened today to mape in the discord in mod discussion.
Steps to reproduce: