Thank you. Yes the pano was taken with my Spark using my iPhone XS. The pano comprised 46 images each 3968x2976 pixels, stitched together on my Windows PC using Microsoft ICE. The resulting pano is 19968 pixels wide.
The challenge then is to find a hosting site which can display the pano interactively at the full resolution. I have tried many of the free websites but most of them don't allow you to upload at the full resolution, or they display at a lower resolution (eg the Kuula free version only uploads upto 16k pixels wide and displays at 8k). I have been using Klapty for 12 months but they no longer have a free version.
I have recently been using Panoee which is free and brilliant - with the best features of them all (virtual tours, customisable hotspots, map showing camera location and direction,.....) I have had an Air 2S for 6 months which gives even better results (panos are 23,552 wide and sharper) and is far more stable than the Spark. I still use the Spark with my A2CofC (UK qualification) for flying in built-up areas and fly the Air 2S under Article 16.
I've taken hundreds of panos and have requests from several local nature conservation and history groups for more. I am just waiting for some decent weather!