In order to insert Flash movies into your page, use Insert > Flash (or go through the toolbar). You may also use a hyperlink to a flash animation; in this case, you will have a full screen view of it as soon as you click on the link.
When you insert a flash movie from your disk into a web page, it will be automatically imported intothe "Media / Flash" folder in ThunderSite.
To modify the properties of a Flash movie, you simply have to choose Properties of the Flash component in the contextual menu (right-click on the Flash movie). This will enable you to preview the result of the modifications in real time (by pressing Apply). You can also access this window by double-clicking on the Flash movie.