Regarding cloud saves, Heroic will let you download or force download them. After that you would just need to place them where they are expected for the game.
I use Heroic on desktop and deck and am a big fan personally.
wip.
Keyoxide: $argon2id$v=19$m=8192,t=2,p=4$jxJjKHbOe6nCL4sFU0cPTQ$dIcs/Q8WShEaiy1l3VRnE34IEC0fcGgB
Regarding cloud saves, Heroic will let you download or force download them. After that you would just need to place them where they are expected for the game.
I use Heroic on desktop and deck and am a big fan personally.
That will depend per game as far as I know.
Native vs wine/proton locations will vary and even when emulating windows some games use “My Games”, “My Documents”, %APPDATA%, etc for the save file location.