If you play Minecraft on your phone if a world gets to big you can’t convert it to realms (my world is 238 Megabytes). This makes 2 problems. The first one is obvious, you can’t convert it to realms. The second one is that the huge world is stuck on your phone and you probably don’t want to delete that world, but since it’s too big it makes playing Minecraft very laggy. This needs to be done before late October, because some people might have really big worlds on an older device and if this comes after October, it’s too late for them!