I am taking photos with regular Millipixels from PureOS Byzantium like everyone else, without setting anything manually aside of triggering the autofocus sequence when necessary (in the latest version it can be triggered by simply tapping the preview; previously you had to cycle the "auto" button). The only thing that I do differently is how I turn the raw DNG file into a JPEG: see https://gitlab.com/dos1/glowup and https://source.puri.sm/-/snippets/1223