let's check the save folder for your game
(from steam library) go to AoC2, right click-> proprieties
then on top: select local files -> browse local files (it will open windoes explorer)
(from windows explorer select)
i think: saves->game->earth->[randomfolder]
you should see your saves, their names are like "1551897714098cjipjzvt"
also there is a file named Age of Civilizations, right-click and edit. If there isnt your save file name (1551897714098cjipjzvt my case) you just have to copy-paste it, at the end add ";" just to be sure it will work.
Hope you understood, if any questions please reply