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Templates work the same way when used in Error Action Wizards as documented above. 

How to set up Multiple Document Actions

It is important to remember that doc action wizards are single select by design. The Additional Email wizard can be used to send an email if you are configuring more than one doc action on a form/flow.

Let's say you want to send an email after your form/flow is submitted but you are also using the Filesystem connector to save your submissions to a directory on a local server. You configure the Filesystem connector wizard to do this. Then your configure the Email data to a specified address wizard to send the email. If you return to the Filesystem connector wizard, after configuring the email wizard, the information that you entered on the Filesystem connector screen will no longer display. In this situation, you can use the email wizard on the Additional Email tab to configure your email