Option 1 - File Manager
If you are using Game Panel, you can easily upload files straight to File Manager:
You can also download them directly to Game Panel from the URL by left-clicking in the file manager and selecting "Download file here" from the menu that opens:
NOTE
Uploading directories is not possible - compress the desired directory first and then proceed with the upload
Downloading files directly from a URL is a much faster process
Option 2 - FTP
If you are using Game Panel, you can connect to your files via an FTP client such as FileZilla. Details for the FTP connection can be found here: