From Google Drive to iReal on Android phone

[Niki]

(1) Android 5.1.1 running on an LG VS880.

(2) On my phone Dropbox says "Can't open [name of playlist] Please download an app that can open this file." iReal Pro is installed and appears to be running normally on this phone. And I've updated the Dropbox app for Android.

Which version of iReal Pro do you have?