Pro - only allows photos added from the iPhone – USB & Wi-Fi Flash Drive – Free Document Manager & iFile Explorer App Review

I just bought the $2.99 version. Says it will work with any files but on the iPhone side, only can add from Photos to Flash Drive. (On ITunes, can add any type of file). Is that limitation to load photos only on the iPhone a bug or a feature?
Review by Alan0 on USB & Wi-Fi Flash Drive – Free Document Manager & iFile Explorer App.