iTunes document sharing is a way to transfer files between desktop and iPad app. It requires the iPad to be physically connected to a computer running iTunes.

Connect your iOS device to your desktop then run iTunes. Once in iTunes you need to follow the screenshots below:

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You can then drag/drop, Add/Save To and even Delete/Rename the various files and folders. This is more of a last resort option for transferring files and it'll work even if the app becomes unusable for some reason. 

The [HereBeDragons] folder is a 'special folder'. It is not presented as a folder within the app and it's used to store certain files (log files and trashed maps etc.) that a user might want to get access to.