Syncing the same world from different devices and able to play

One of the major problems of Minecraft, that other games have already solved, is that we can only play our world in only one device. Yes, we can put the world file into a cloud storage and download it from the destination device, but its really annoying to do it, and the world does not even save, like for example I made progress in my world from my device that the world is in, and if the world file is also in another device, that progress does not save in the other device. They should make it so we can sync and download worlds from other devices by connecting them, and download or put a world into another device, and its able to save progress across all the devices, can only be done if connected to internet (of course). It would be really helpful and everyone would love it if it came in the next update!