Greetings! 

Can someone please help me with my question? 

We are planing to sell demo-version of our game on itchio, and later, when we release full version of the game on Steam, we want to send steam keys for players who already bought demo version on itchio. How can i set up distribute steam key, when we dont have keys yet? Or i can do it later, so players who bought the game can claim steam keys for full game?

Looking for forward for your reply

Thanks

Hey, you can add Steam keys to your project page at any time. They'll be made available to everyone who has bought the game, and any itch.io download key's you've generated that give access to "external keys"

More info about external keys

Thanks for reply