would say thanks for the nice game ...
Suggest an additional multiplayer play style ..
Called "PlaybyEmail" (perfect for turn based strategic games where turn times can grow ...)
Hand based -> The players musst self picked the save file after turn-end and optional pack it, then send it to the next opponent, he optional depack it and move it to the save folder , then load it, make his turn and send it to the next/other player ..
Server based -> the turn is on the end uploaded to an server from stardock(or others) and from the here the next player load it and so one ... (this is how Order of Battle WW2 works - it works (if the server not have problems .....) good for unexperienced players where have trouble with pick/pack/send-recive/unpack and right place the save files ... but i prefer still the self hand way - as it works without an 3d party involved (the server hoster/service..) )