Steps
Getting your local save file
Your save file is hidden away on your computer, you will be able to find it in this location:
*C:\Users{username}\AppData\LocalLow\Endnight\SonsOfTheForest\Saves*

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Open the folder with all the digits, e.g. 76561197967057037
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Open 'Singleplayer' or 'Multiplayer'
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Open the most recent save (or the one you know you want to upload)

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Zip the files or transfer the files via FTP. Our FTP Guide can be found here
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The files need to be placed in userData/Saves/DedicatedServer/Multiplayer/0000000001
- If you're not using slot 1 you will need to pick the folder relevant to the slot
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Restart your server
