Submitting a transaction can be done in three steps.
Tap on the incomplete transaction or notification
Take a picture of the receipt. Tap on the white circle outline to capture the photo.
Record the business purpose. After taking a photo, a screen will popup like the one below, prompting you to speak the business purpose. Once you are satisfied with the purpose, tap the Submit button.
Tip: wait until you see the wave animation appear to start speaking to ensure that the microphone is on.