from that description they are saying that notification popup on the screen after each shot is not showing up and privacy policies are not found.

They might have problems in dropbox or they may not. First when I tried the application, I was also wondering that I don't see any pics in Dropbox, untill I found which folder it uploads it them to, as that is not that trivial thing to find. Maybe you should attach some screenshots for them about what folder they should check the pics to appear into.