How can I access a FTP or WebDAV server in USB Disk?

Press the "Edit" button on USB Disk's home screen. Then press the "Add" cell that appeared. Select "FTP" or "WebDAV" as the type of server you want to connect to, then enter the address, user name and password for the connection. When connecting to a WebDAV server over a secure connection and setup the server yourself you might need to deactivate the "Validate certificate" option (when this option is deactivated, the app will not check the identity of the server). Finally, press "Done" twice. This will add a new item on the home screen. Pressing it will let you browse the FTP server as you browse local files.