to the server - are you doing it from within FrontPage? If you are not, and you're using one of the dedicated FTP programs you can hit this kind of problem. FrontPage needs to generate special files on the server to make hover buttons work.
Surface Pro (2017) vs Surface Pro 4
20 groundbreaking 3D animation technologies coming to Siggraph 2017
iPad Pro 12.9 vs Surface Pro 5