Thank you for the update. I'll mention a couple of other things, in case anyone has similar issues and finds this in a search.
On PC, other than restarting the game, there are a couple of ways you can confirm what saves have been synced online.
In Windows, the program
Steam Cloud File Manager Lite (
download) can list, download, delete or upload saves. You need to be logged in to the Steam client and have the game's AppID (435150).
When logged in to Steam in a browser, the
remote storage page will let you see what files are in cloud storate (this will also let you download saves, but you would need to manually rename them, as Steam combines the path and name together for the online name).
One person who couldn't enable Steam syncing had their saves listed online, but not the profile files. Creating a second profile in Steam got it to sync both online, and the Switch was able to sync.
If not all saves are synced online, or Switch saves will sync to PC but not back again, it may help to clear your Steam client cloud cache.
Exit out of Steam, in the Steam install folder browse to the 'userdata' folder and find the game's folder ('435150'; it will be in a numbered folder which is different for each user), then delete the 'remote' folder and remotecache.vdf file there, restart Steam and then D:OS 2. If there are multiple Steam ID folders with '435150' subfolders, delete the contents of each.
C:\Program Files (x86)\Steam\userdata\<SteamID>\435150
