We use Apple's ahred files system for transferring files back and forth currently, here's how to do it:
-Dock your iPad to your computer and launch iTunes on the computer
-Open your iPad in the left navigation bar in iTunes.
-Click 'Apps' along the top to show your iPad's apps page
-Scroll down to 'shared files' then click ArtRage to view all the app's shared files to the right.
Here you should see all your saved ArtRage paintings and you can drag paintings from your computer into this location, as well as save existing paintings to your computer.
I hope this helps, but if you have any questions feel free to let us know and we should be able to assist.
Resident Bug-Hunter and Support Guy