The location of saved files is Documents folder in RollCanvas on your iPad.
If you have a PC, you can access Documents folder via iTunes and add and remove files there.
To access Documents folder using iTunes, first connect your iPad to your PC with a cable and start up iTunes.
There is an iPad button(1) on the upper-left, so click that to change screens.
Tapping Apps button on the left-hand side(2) will switch the right-hand side to a list of apps installed on your iPad.
In the lower section on the right is a list of apps(3) that can access Documents folder, including the RollCanvas icon,
so click that to display Documents folder(4).
If you drag and drop a .rcvs file to Documents folder, you will be able to open the file in RollCanvas.
You can send the saved file to someone if your email is setup or an appropriate app is installed.
To send a file, first tap File button to display File View.
File button is displayed when you tap I/O button on the toolbar. It is also in Home View.
Next, tap Send button in File View to display the destination apps,
and you can send the file to those apps.
If RollCanvas File Downloader is shown among those that are displayed, do not select it.
That is for use when sending files to RollCanvas from other apps.