I tried out its features for importing images, adding narration and exporting the finished video and I'm happy to say it has worked very easily so far. I made a quick screen recording of the process so I could share it with teachers and students in my district.
This is new for all of us, but in case this helps others to get started with Spark, here's the video:
If you are interested in this post, you might also like my Tech Project Packs. Each one is a collection of resources for tech projects you can use in any class or subject.