I want to save my worlds

Why did we add the function of storing files in the application to the game? Why are the players not warned about this from the very beginning, why is it set automatically in the settings and why then my profile, when deleted, does not save the data of neither cards nor purchases, and I even lost my cloak. Why such a function and why did not you add the function of transferring worlds from the application to the storage. Many players suffer from this, losing worlds that have been building for so long because they simply did not know about this function. This is a mockery of players in Minecraft pe. I lost the world and my cloak, and no one is going to return it to me, just like the maps built by my labor. For what? Why such a useless function? How can I now save my worlds that I have in the application?