to support transparency you need to export as PNG.
Hope it helps,
you need to export as png to the camera roll, I haven't bought the app yet, if this is possible and works right i will. do you know if there is any tutorial or images?
Yes, the application can export as PNG.
You have some tutorials inside the application.
When it comes to images - do you mean sample images?
There are also some videos from Russel Brown that you can give a look - http://tv.adobe.com/show/the-russell-brown-show/