..Carse1..
While several choices exist with varying instructions on how to make a Slideshow
with an iPhone, with Photos; third-party apps also appear in search results too.
Play videos and slideshows in Photos on iPhone - Apple Support
How to Create a Slideshow With the Photos App on Your iPhone or iPad | PCMag
https://duckduckgo.com/?q=how+to+make+slideshows+in+iPhone+and+Photos&t=ftsa&ia=web
And for those with 'workstation' needs, a Mac (with or without iMovie) also adds
a bit more flexibility to this task; and instructions for iMovie do not seem hard.
..If you already have an Apple application, this should be next-to-no cost to you..
Create slideshows in Photos on Mac - Apple Support
//support.apple.com/guide/photos/create-slideshows-phtae8c6d40/7.0/mac/12.0
Some instructions found to make a Slideshow with Photos in iPhone, offer basic
elements & means to share them; locally or online. (or on youtube channel, too?)
