When the Camera app is used in Pro mode (necessary to shoot RAW files) there's no 2x button for accessing the telephoto lens. It's possible to zoom but this uses only the normal wideangle lens, so you get a digitally zoomed, lower resolution JPEG and a RAW file showing a wider field of view at full resolution.
It seems to me this is an unfortunate omission because people who are into photography are most likely to want to shoot in RAW and be concerned about image quality. And it can probably be fixed easily by a developer adding the 2x telephoto button already present in the Auto mode to the Pro one.
If any Samsung developers are reading this, please upgrade the Camera app to incorporate this change.
I wish I knew. Is there anyone here from Samsung who can answer us? Currently a lot of people feel poorly treated because a software shortcoming means we can't use a hardware feature we've paid for.