How to Add a New World to Your Minecraft Server
Step 1: Stop your server from the control panel.
Step 2: Open File Manager.
Step 3: Upload your world file (ZIP format).
Step 4: Extract the ZIP file inside the main server directory.
Step 5: Make sure the folder name matches the world name in server.properties.
Step 6: Start the server again.
Your new world will now load automatically.