Playing a movie clip inside a frame (how?) [newbie question]

hi

im trying to create a movie with loads of transitions so what I want to do to make it simpler is to have movie clip inside every second frame, so that it plays them one by one.

However I started and placed a movie clip symbol on frame 4 of my animation which I wanted flash to play - but it skips right over it and moves on to play the rest of the content and never enters this movie clip symbol or play it.

What am I doing wrong here?
Can someone guide me how I can make this hapen so that when the flash reaches frame 4 it plays the movie clip there first and then moves on to the next frame without looping the same movie.

Thanks

Aku C:-)