Steam, when I launch the game, has been saying it’s ‘unable to sync save games,’ with dire warnngs of losing progress. So far I just went forward anyway and all seems well, but I keep getting that message. Now, maybe that’s a steam error, but I thought I’d let you know.
Worth reaching out to Steam Support. They’ll be able to advise better than I. 
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Did you ever get a solution for this? I have the same issue.
Found the solution: [Solved:] Steam was unable to sync your files ... Steam Cloud :: Help and Tips