We explain how you can upload your own Valheim existing world in your server.
World Location
First you need your existing world. This can be found by default at C:\Users\(Computer Username)\AppData\LocalLow\IronGate\Valheim\worlds
Create a .zip file of all world files. Our world here is called "EtheronHosting".
Upload world
Upload your newly created zip file via the File manager to the following location:
/.config/unity3d/IronGate/Valheim/worlds_local
Drag your zip file into this worlds_local folder and right click on Decompress.
Change server settings
Now that your world has been uploaded, all you need to do is configure your server to use this world.
Go to Configuration > Startup Parameters and set the world name like the world you uploaded. Press ENTER or Update Startup Parameters at the top to save this change.
Do you have any questions? Let us know!