I have been using Camtasia for years and did not think this was possible. I produce an MP4 in Adobe After Effects and imported it into Camtasia. I wanted to extend the end of the video to add additional audio. However, (this is so strange) when I clip the video and extend it, I only see the layer below (from After Effects) my top layer disappears. shouldn't the MP4 contain a smashed version of my production? Apparently, the MP4 hangs on to the Adobe layers, but how? What is going on? Does anyone have experience with this?