Your system information

• Steam client version 1677204767 (Desktop) and 1676336721 (Steam Deck)
• Arch Linux and SteamOS
• Opted into Steam client beta?: Yes on Desktop, No on Deck
• Have you checked for system updates?: Yes

Please describe your issue in as much detail as possible:

I played the Wo Long: Fallen Dynasty Demo (2285240) on my Linux Desktop, on my Windows Desktop and on my Steam Deck.

All of them now have their own unique save, even though the game has Steam Cloud support: https://store.steampowered.com/account/remotestorageapp/?appid=1448440 (this is the appid of the full game which I do not own), but it is linked to the demo https://store.steampowered.com/account/remotestorageapp/?appid=2285240.
That makes sense since you can carry your save over to the full release.

The cloud save available from the steam website is the Windows save.

I don't get a popup on start where Steam asks me which save file version I want to use.

All three systems tell me "Steam Cloud: up to date".

On Linux Desktop and Deck I see the following (0 bytes used):

Meanwhile on Windows it shows that cloud storage is actually being used:

Some maybe relevant cloud log excerpt:

Steam Deck cloud log:

[2023-03-01 11:19:52] [AppID 2285240] Unable to resolve path with root WinMyDocuments (2)
[2023-03-01 11:19:52] [AppID 2285240] Unable to resolve path with root WinMyDocuments (2)
[2023-03-01 11:19:52] [AppID 2285240] Need to sync from local change number '12142485433019043956' to global change number '13346187548985789301', but not attempting now
[2023-03-01 11:19:52] [AppID 2285240] Skipping download of file KoeiTecmo/WolongDemo/Savedata/redacted/SAVEDATA00/SAVEDATA.BIN to our platform
[2023-03-01 11:19:52] [AppID 2285240] Skipping download of file KoeiTecmo/WolongDemo/Savedata/redacted/SYSTEMSAVEDATA00/SAVEDATA.BIN to our platform
[2023-03-01 11:19:52] [AppID 2285240] Eval complete
[2023-03-01 11:19:52] [AppID 2285240] YldWriteCacheDirectoryToFile - saved to '/home/deck/.local/share/Steam/userdata/redacted/2285240/remotecache.vdf'

Windows cloud log:

[2023-03-01 11:28:32] [AppID 2285240] Starting sync (AC Launch,down,)
[2023-03-01 11:28:32] [AppID 2285240] AutoCloud checking local state for user redacted
[2023-03-01 11:28:32] [AppID 2285240] Currently already synced to global change number '13346187548985789301', should be nothing to download
[2023-03-01 11:28:32] [AppID 2285240] Download complete in build list
[2023-03-01 11:28:33] [AppID 2285240] Successfully synced to ChangeNumber 0
[2023-03-01 11:28:33] [AppID 2285240] Running AutoCloud on launch. Looking for existing files to watch:
[2023-03-01 11:28:33] [AppID 2285240]     Watching file C:\Users\redacted\Documents\KoeiTecmo\WolongDemo\Savedata\redacted\SAVEDATA00\SAVEDATA.BIN
[2023-03-01 11:28:33] [AppID 2285240]     Watching file C:\Users\redacted\Documents\KoeiTecmo\WolongDemo\Savedata\redacted\SYSTEMSAVEDATA00\SAVEDATA.BIN
[2023-03-01 11:28:33] [AppID 2285240] AutoCloud done. Watching 2 files
[2023-03-01 11:28:33] [AppID 2285240] YldWriteCacheDirectoryToFile - saved to 'C:\Program Files (x86)\Steam/userdata/redacted/2285240/remotecache.vdf'

Steps for reproducing this issue:

1. I don't know
2. how to
3. reproduce this, see above.