If you're having trouble using Underpass, the solution to common problems can be found in Troubleshooting.
You can also check the list of Frequently Asked Questions.
The Underpass web site may have updated and supplemental information not yet published in this help manual.
You can email support with questions, requests, or feedback. Please include the version numbers of Underpass and iOS in your email. The version of Underpass can be seen in the Purchased apps section of App Store in iOS or in the iTunes for Mac apps library. The version of iOS is displayed by the Settings app in the section General > About > Version.