Perhaps
look here if possible im not a SDeck user... but ive added a link below as well

Pinned Post from Forums

"Local files can be found at:
Windows: C:\Users\USERNAME\AppData\LocalLow\IronGate\Valheim
Linux: .config/unity3d/IronGate/Valheim

Steam Cloud save folder:
Windows: Steam\userdata\NUMERICSTEAMID\892970\remote
Linux: .steam/steam/userdata/NUMERICSTEAMID/892970/remote

A final note on the Steam Cloud save folder – In the ‘892970’ folder you will also see a folder named “ac” (auto cloud) which stores your old legacy saves. With this new system, we simply keep this one enabled as well."

From your steam account hope this works Skall !!

https://store.steampowered.com/account/remotestorage