Not able to use media from Assets

I am trying to reuse the assets and when I click on the slide/image/icons I am not able to import and use them. its urgent need can someone help me here? captivate version: 12.0.0.2892

Publishing MP4 output

Hi, I am looking to publish my software simulation demo project as a MP4 file, but when I click Publish I do not find the any other option except HTML. Could you please help me? I am using the latest version 12