This may help in the direction of travel:
https://initiostar.co.uk/demo/Icecream-Video/
I tested the free version of the Icecream Video Editor out of curiously, added for 4 slides and a slide-in "motion". Then added a custom Xara slider with the same photos; a slightly different transition/motion. You can see the effect/delay in the page load with the video taking its time to load.
The Xara slider needs (in this example) just ONE line of code.
@E you are welcome to play around with the example; you will see it is exported with a slide-in transition, but other than that it is standard Xara functionality.
Attachment 133966
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