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Hi,     how do we sync itch with steam ??

I googled it with nothing, I also utubed it with also nothing

Hi,

           I got itch logged in then brought the game, but I havn't yet sync'd with steam (does this mean I wont be getting a steam key?) 

           Was a meant to sync Itch with steam before purchase ???

            Also how do I link them ???  I have looked all thu Itch

thanks :)