Board Thread:Questions and Answers/@comment-30333035-20170110040955/@comment-28905095-20170116220240

Sorry for a little late reply, but his is very doable on iOS. One way to do this is to use iFunBox found both for Windows and Mac. Using this tool you can connect your iOS device, copy out the world files, zip them and then rename the .zip file to .mcworld and upload the file somewhere.