There are lots of options for exporting (sharing) single images from the Frames Viewer - saving to whichever cloud storage or graphics apps that are installed. Unfortunately, on my device at least, there seems to be no simple Export to Gallery option.
Adding this would make it easy to use the drawing tools in FlipaClip to create a background image, which could then be exported to the gallery and imported via the Project Settings dialogue. This is already possible with the options mentioned above, but it seems that the device's gallery would be the obvious place to store the exported image.
Customer support service by UserEcho