Thank you for the reply, @moondefer. Unfortunately, Hyperspin crashes (or simply fails to launch) before presenting any folder path options. It did give me the permissions question right after install, to which I said “allow,” but then the screen goes dark and the app quits.
To date, all I have done is loaded the .apk into my downloads folder (from this thread on to a PC, then moved to the Shield via my local network), created a “Hyperspin” folder at the root level (Shield—>Internal—>Hyperspin… since I’m using internal/extended storage, not external), and then launched the install from my downloads folder. I’m in developer mode, btw.
If anyone sees anything wrong in what I’m doing, please let me know!