1. Press ⊞ Win + R
on your keyboard.
2. In the run box, type %AppData%
3. Navigate to .minecraft\saves\
4. Locate the folder with the name of your world.
1. Open the File Manager
2. Navigate to /minecraft/
3. Drag the world's folder into the /minecraft/
folder.
*Note: If the world folder is large it's faster to zip it
4. Change the Custom Save Name in the Basic Server Settings to match the world folder name
5. Restart the server and the save will load onto the server.