Hi Miranda!

You can create your own custom paper sizes by going to the Laserfiche Snapshot Configuration (Current User) settings. You should be able to find this configuration dialog by doing a search in the Start Menu. Under the general tab, click on the "Preferences" button and then select "Edit Paper List":

This will open up a dialog that will allow you to create your own custom paper sizes. More information can be found in this help file.

Hope that helps!