Webtrends Analytics 9 Adminstration Guide, November 2012
Because Flash files are typically embedded as an object in web content, most web servers do not record a visitor's interaction with a Flash file.
Browsers that include the Flash plug-in recognize the file type and launch the Flash application. After the Flash file loads, interaction with the application remains local to the web client's machine and does not typically generate hits to the content provider's web server log file. The following steps are required for tracking Flash interactions: