I also have a bunch of *.map files in that directory. And am also on Nexus 7 (2013). Oddly, on this tablet Charles and I /don't/' have an sdcard, since there is no physical slot for it. (I assume the directory is so labeled for compatibility, and ---in case it helps--- points to '/storage/emulated/0') You actually have an SD card and get no 'emacs' directory. I wonder if the /emacs directory got installed to another place, or if it somehow didn't get installed at all.
I'll revoke my "bug fixed" comment on the bug I filed on
the developers' bug tracker, and reference this conversation. Oddly, just now that server is unreachable to me. I did just send a short note on their
web-contact form, where you can also find their IRC channel, if you want to contact them.
I have since had a little more trouble with org-mode on Zhaolin using 16pt font. (odd cursor jump after column 70). I don't seem to have the problem with 20pt font (which limits the terminal size).
Please scold me if HTML email and links are unwelcome. I haven't been active on this list in a few years, and forget the protocol.
I hope this eventually works well. I may try a full linux as instead, but org-mode on non-rooted Android is useful.