are you sure you put it in the correct folder? the directory has to be something like this
C:\Users\(Name of User)\AppData\Local\Packages\Microsoft.MinecraftUWP_8wekyb3d8bbwe\LocalState\games\com.mojang\minecraftWorlds
Sure. Download and then follow either of these guides:
Android: http://mcpedl.com/how-to-install-minecraft-pe-maps-for-android/
iOS: http://www.wikihow.com/Download-Minecraft-Maps#Installing_Maps_on_iOS
How does your device look? Does it have any apple icon somewhere on it? Does it have any text or some logo on it? Please try and describe it as best as you can and I'll try and help you. :)
>:(
It doesn't appear in the worlds
C:\Users\(Name of User)\AppData\Local\Packages\Microsoft.MinecraftUWP_8wekyb3d8bbwe\LocalState\games\com.mojang\minecraftWorlds
Android: http://mcpedl.com/how-to-install-minecraft-pe-maps-for-android/
iOS: http://www.wikihow.com/Download-Minecraft-Maps#Installing_Maps_on_iOS