My decсzion - android flyme 6.3.2 on Meizu m3s. OLD but only for GPS
I Made folder iGO on sd card and put in ALL structure of Primo Is 9.6.29.636868. In phone storage made empty folder iGO.
and my section in sys.txt is:

[folders]
linked_root_list="/storage/sdcard1/iGO" ;PUT ALL FILES HERE (SD card - Total commander says "ssdcard1")
has_secondary_root=1
android_secondary_root_path="/storage/emulated/0/iGO" ;Here primo will makes folders and saves data(folder SAVE, content...)
data="/storage/emulated/0/iGO" ; This is phone (inside memory)

No folders in "Android/data...." and so on.