Minecraft wiki entry for Custom_maps, associated text: On mobile, you will first need to locate the Minecraft folder. In iOS, you can access this in the “Files” app in the "On My iPhone” or “On My iPad” or “On My iPod” category. Once in the Minecraft folder, you will need to go to "Minecraft/games/com.mojang/minecraftWorlds/" In this folder, you can find all of your Minecraft worlds in folders with randomized names. It may be helpful to sort the folders by date modified.