Here’s a tip - Rather than buy an IPhone, I bought a Google Pixel and a second hand DJI drone.
When using the 3 photo AEB feature on the drone, I’d download the photos to my Google Photos. About an hour after getting home, and Google has backed up the photos to the cloud, I used to get pinged that Photos had generated an HDR version, which I could download. (Also it would sometimes generate panoramas from a set of photos, either phone camera, or drone).
About a couple of years ago this feature vanished, the Google algorithm focuses on memories, collages and stylised photos.
However… it actually DOES still make HDR photos by stacking the -3,0,+3 ev.
Log into google, open a new window and go to p h o t o s . g o o g l e . c o m you will see photos similar to when using the Photos App. Add a forward slash and unsaved
`h t t p s :// p h o t o s . g o o g l e . c o m / u n s a v e d’ and you will see all sorts of google generated files, which you have the option to save.
Anyway - Enjoy!