If you use a third party email application (Outlook, Gmail), you should see that application in the list after you tap on the export button.
If you do not see your email application, it might not be activated in the Share Sheet.
To activate your 3rd party email application:
1. Scroll list to the right until you see the More button. Tap on it.
2. If the button next to your email app is not green, then you will need to activate your app by turning the switch on.
3. Once the email application is active in the Share Sheet, you will see your email application when you tap on the Export button inside the VB-MAPP app.