Astroneer

Save Game Location

%USERPROFILE%/AppData/Local/Astro/Saved/SaveGames

Example:
   SNAIL$2025.03.23-19.24.11.savegame

AMP

Disable Encryption

WARNING: Running Astroneer on Linux requires encryption to be disabled on both server and clients. USE AT YOUR OWN RISK. To disable encryption on a client, add net.AllowEncryption=False under the [SystemSettings] header in %LocalAppData%\Astro\Saved\Config\WindowsNoEditor\Engine.ini

%LocalAppData%\Astro\Saved\Config\WindowsNoEditor\Engine.ini

[SystemSettings]
net.AllowEncryption=False

AMP Save Location

~/.ampdata/instances/Astroneer01/astroneer/728470/Astro/Saved/SaveGames/
  'SAVE_1$2025.03.23-04.00.34.savegame'

Created a new one called "SNAIL" and replaced the above, and this worked:
  SNAIL$2025.03.23-19.24.11.savegame