Service to work with players shared data?

Hello.
Is there an easy way to let users to exchange/share some data?
(—In my case users are Google-Play-Games players—)
For example - players of some Game may create some mods of the Game; for example - new maps. Then players may test other players maps and to rate them, making the Game more interesting.
May be there exist some GPG or SDKBOX service? Pleeease…

Upd:

  1. May be the solution is Firebase Realtime Database for Android?
  2. Is it free and code-able in Cocos (C++)?
  3. In other hand - what is the best cloud service for Cocos+Android+C++ ?

I think Firebase Realtime Database is a choose for you. It works on iOS/Android.

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