Samsung release an updated Expert Raw update and you can install (manually via APK).
The latest version is 188.8.131.52 and the new feature is the option to save RAW files in High Efficiency RAW format. What this basically will give you is a file size reduction from 3-5 MBs. Format remains DNG which you can then later use for tweaking white balance, picture color and other corrections.
Download Samsung Expert RAW app 184.108.40.206 version
I did 2 video shootouts one outside in the open testing all 4 camera sensors, UW, 1x, 3x and 10x and 1 shootout inside and then compared sizes.
If you are interested you can check my video here: