screen grab 1st frame of swf

I understand that Lectora automatically takes a screen grab of the first frame of the swf and displays it while the swf is loading. At what point is this done? During the publishing of the title, or everytime a user loads the pageI understand that Lectora automatically takes a screen grab of the first frame of the swf and displays it while the swf is loading. At what point is this done? During the publishing of the title, or everytime a user loads the page

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