iPhone 13s may require updating to iOS 15.3.1 (or most recent available iOS version) to properly sync audio/video on SalesMail videos that use flip camera
Users on iPhone 13s who are running iOS version 15.2.1 or earlier may run into issues with audio/video getting out of sync after using flip camera feature. Updating the phone to the latest version of iOS from Apple (currently 15.3.1) will resolve this issue.
How to update iOS on iPhone: