Login to your server's control panel
Navigate to your Enshrouded server.
Stop your server if it is running.
Click the File Manager option.
Navigate to the 'savegame' folder
Upload your world save file. This is usually named 3ad85aea
The default save location for locally hosted games on your PC would be
C:\Program Files (x86)\Steam\userdata\<accountID>\1203620\remote\