Since Thin File Putter is a Java Applet, your browser needs to have the java plug in installed. If the plug in is not available, the browser may prompt you to install it.
Just drag and drop your files onto the applet and they will be uploaded. This demo is configured to make use of the HTTP PUT method rather than the POST method. It is also configured to accept files with a total size should be less than 5MB.
The transfer can be resumed if it is interrupted.