Live wallpaper “motion not available” error

I’ve tried this with photos I’ve taken, Live Photos I’ve downloaded and I keep getting an error message saying “Motion Not Available

Motion from this Live Photo is not supported as a wallpaper.”

It’s driving me mad as one of the photos I tried (of literally 20+!) was an original iPhone live wallpaper I had saved from my old phone! How can new phones and new iOS go backward?!

I also tried downloading an app that apparently makes live wallpapers for Apple devices but that’s hit and miss and stops working.