A:AnswerThis drive uses Lightning to connect. It "may" work with a 30-pin to Lightening adapter, but that is a pretty old device. The current app supports iOS 8.3 but YMMV.
A:AnswerNo, those pictures you just copied will not automatically be copied. You can either choose the option "cut" or "moved all". If the option is only "copy" you need to delete the files from the device manually.
To your question that is does not copy successfully, the photo file might be corrupted. You may want to restart your device and retry.
A:AnswerYes it is, I have two one for my iPhone and one for my iPad. The app is great because you can review what you want before you save your doc or pic and it will ask you if you want to download all pic or do you want to chose. It's well worth the price. The only downfall is that it doesn't come with a cover. But if you have extra flash drives that you don't use there covers fit.