How do I save a slideshow in Gallery?
Slideshows are automatically formatted and set to music. Tap Library, then view photos by All Photos or Days. Tap Select. Tap Slideshow from the list of options.
How do you make a slideshow on iPhone and save it?
In the Photos app on your Mac, click a slideshow under Projects in the sidebar. Click Export in the toolbar, or choose File > Export > Export Slideshow. Enter a filename for your slideshow movie in the Save As field. Click the Format pop-up menu and choose a file type for the exported movie.