1. Zip the world ( On Windows right-click the folder -> Compress to ZIP file )
2. Select the upload file button on the File Manager, then select the ZIP file and upload it
3. Right-click the file and press Unzip
5. Run /mv import (world name) (environment type)
(Environment Types: Normal, Nether, End
The name of the world is the name of the folder you unzipped. Make sure it doesn't contain any spaces or special characters)
6. /mv tp (world name)