In my previous version of iMovie running on my iMac I could easily create a trailer (a quick preview of the video) to run at the start of my new movie. The trailer and the movie were all part of the same file.
With my new Mac Pro running iMovie 10.0.3 I created a 1 minute trailer of a recent camping trip. I like te excitement the trailer creates. I also created a one hour video of the trip itself.
These are two separate files in my Project library. How do I get the trailer to run at the start of my hour long video?