Can we use iOS camera app for shooting raw photos ? I don’t see any option in there. If not what would be a good alternative.
Halide is a popular option for shooting raws. It has other nice features, too.
For editing you can use the camera apps, but Google’s free Snapseed offers more features. Lightroom too (especially unlocked if you have a Creative Cloud subscription). But I tend to resort to Darkroom, which recently went subscription, but they grandfathered-in all features to people like me who’d previously paid for the full-unlock of the app.