You can add flash animations to a question by creating your animation with a Flash tool, exporting it as Flash 8 (or earlier) and attaching it to your question. You add your Flash animation file in the same way as you would add an image, see the section onAdding Questions for more information.
Image zooming also applies to Flash content - if you want quiz takers to be able zoom the Flash content with their mouse, tick the 'Use Image Zooming' checkbox in the Question OptionsGeneral Question Properties. Usually if the Flash is interactive, you'll want this switched off.
Using Flash content is a good way to include audio and video in your quiz.