@peemee Thanks. I read a bit more about it here:
https://www.lux.camera/introducing-process-zero-for-iphone/
I recently dabbled with one or two raw photo apps on my iPhone but I can't get the raw files onto my laptop. These apps all seem to be predicated on the idea that you develop the raw on the iOS device then share the jpg/HEIC. It's a bag of hurt for me.