Hello! The game should automatically import your S1 save for you, as long as you played through S1 on the same computer and haven't moved the savefile.
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Thanks for getting back to me! For some reason, my S1 save file was in a folder called com.Company.ProductName in my Library, so I think S2 wasn't recognizing it? I tried running S1 again, and it created a new folder in the Library with a different name, so I dragged the save file into it and now S2 likes it :)