When using the Ken Burns effect in Photos, a movie added does not play thru. Is there a fix?
But if I play it in Classic slideshow mode then it plays. Should I be using another slide/movie app and also to include text overlays describing the image?
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Currently the only theme the supports both stills and videos is Classic. Tell Apple what missing features you'd like restored or new features added in Photos via Feedback - Photos - Apple
There are some slideshow apps that can do what you want. However, Apple's Keynote app can do everything you want. Create the slideshow in it and export as a movie file.
This webpage describes the 15 Best Mac Interactive Presentation & SlideShow Software (2018). Keynote is listed as are others, some of which have demo versions you can try out before purchasing.