I'm not sure what seems to be the problem in the second screenshot, LOS is only shown as far as the longest attack range (in this case HE is the only type, indicated by the yellow outline). I suppose extending the faded area outside of the furthest range could help.
Sorry, it's not currently possible to load games into multiplayer.
Approaching the early access release we had limited ability to test multiplayer and this feature had to be delayed due to security concerns.
It should be added in the future.
Depending on the implementation, the player performing the load could have the ability to send ANY file to the other player's save folder. For the most part this would concern users who mistakenly click on the received files outside of the game but I'm also wondering if it's possible to inject other malicious things that can trigger from inside the game.
I'm not very knowledgable on security so I'm just trying to be cautious.