Hello @monterrr, save game locations are not standardized and this needs to be configured on a per-game basis. Additionally, games that support multiple OSes have to consider possible cross-OS variations in the save file format and what effect that may have before setting up a common save folder or making per-OS save folders to avoid conflicts.
There's no magic bullet to enable this for all games.
Can at least steam add the option for the user to do the heavy work and save the files that the user identifies manually as the saves?
Nothing extracted yet.
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I think steam could add cloud saving to all games, even ones without support for it.