Was testing #zappl from Chrome and android app. It works from Chrome but not on app (please refer to my screenshot, no option to add media). It doesn't work from Safari 9 too (I cannot update iOS using cellular data). I'm giving up zappl app for the second time :(
I am glad #busy is working for me both from Chrome on Android 6 and iPhone Safari 9 now.
Just go to your steemit wallet, click "permissions" and copy your "POSTING KEY". Go to zapple.com and login using your steemit username and your posting key (not the generated password).
