2nd Save in TBGDuel Core Link Does not Work

I got the Link Cable working with TBGDuel but I can’t have a Save on the 2nd Gameboy in the Link. I even tried to play a Game on there and Save It. I tried that but once I got out of RetroArch and it tried it again the Save was Gone.

So is there a Way I can get the 2nd Save to work on the TBGDuel Core?

I am using Windows 10