This thread is a continuation of a topic raised here and continued for some posts in that thread,
but it's off-topic >to continue it< there.
- Briefly: you must have Camera 2 API factory installed. You cannot (short of re-flashing the ROM) get
it on a phone without it. Consequently so-called RAW camera apps WON'T work. You will either get a
message saying the app is not compatible with your phone or the RAW feature will not come up.
It's (the Camera 2 API) installed in "high-end" phones, like Galaxy S7, but not my S5