World export

Please give us a function to upload worlds to be able to download them on new devices under the same account because this issue of not being able to play your Minecraft worlds on a new/better device is really bad for player moral. How are we supposed to enjoy playing with less lag on our worlds on a better device without a function that allows us to transfer worlds or export worlds especially on Android and iOS. We need to be able to get our worlds on better devices some how.