Unfortunately on my phone (Samsung S7 edge) it does not move OBB files, just the app itself which is pretty small. The OBB file is 1.71 Gigabytes.
When you get a chance, please take a look in your Android/obb/com.simulationcurriculum.skysafari6pro directory on the internal memory and see if it's still there. I'd be interested to know if it's just my old 6.01 Android OS that's the problem.
You might be right. Google "How do I move apps on Android 6?" and see if the resulting instructions work for you.
I'm on Android 8 on my Samsung S7 Edge and its easy to do now.
EDITS - Wait, never mind, I see what you mean, the OBB file still sits on the internal location - I misunderstood what you were trying to do - ignore me.
Further Edits - I moved mine from internal to external and you are correct in that the OBB file still stays on the internal and takes up 1.71 Gigabytes, so basically the move did almost nothing. I learned something new today, but I have to wonder if there is some critical reason that it doesn't move that file. Performance, perhaps?
Edited by timmbottoni, 06 September 2018 - 03:40 PM.