Hi frnds today facing one problem with my phone (redmi 2 prime), the problem occurs when I recently received the update called MIUI Global 7.2 Stable version, update is awesome so dont worry about that.
I got problem with Musixmatch (it's a music player) app, when try to save/fetch the file its the message like this, "TURN ON DOCUMENTS IN SETTING / INSTALLED APP FIRST".
I think every user would face this type of problem, at any time or some of the users are already face the problem.
and the solution of the problem is
go to settings > on the bottom choose installed apps > on the top choose "ALL" > go to the bottom find Documents app (its in bottom because disabled) > enabled it with pressing enable on the bottom screen..
that's it folkes, I hope it is helpful to every one....