The iPhone has a facility whereby, when it feels like it (typically after a trip abroad), it tells me "you have a new memory" and gives me a short movie with photos and video clips of its choosing. This can be customised to some extent by adding and removing photos.
Is there a way to select a bunch of photos and video clips and then invoke that movie-making engine on it?
Plus points if I can add photos not taken on the iPhone (e.g. on my DSLR). Extra plus points if I don't have to stick any of the photos involved in iCloud. Extra plus points if I can do the job on my mac rather than on the iPhone.