So I just played around with it, and made a short "movie" which is basically a slide show. I did this from my iPhone. I opened up iMovie, selected Start a New Project, then selected "Magic Movie". It asked me to select from photos on my iPhone. I tapped on my husband's name, and it pulled several photos of him. Music was added (not something I would have chosen). After these steps, I have a movie. I was able to tinker around with it and choose different music. I haven't tried to create captions yet, but this may be a good option for you!