File Upload Choose a file on your computer and click upload to transfer it to the server. Filename: There is no error message if a file is too large to upload. The maximum file size depends on the speed of your Internet connection. Try to limit files to 50kb for a dialup, and 300kb for a cable modem. Your connection may allow significantly larger files to be uploaded. If you are uploading an image, be sure to convert it to either a GIF or JPG as these are the most common (and efficient) for Internet use.