To capture a photo of a visitor start on your buttons page, select 'Existing Buttons' on the right then click the 'edit' on the far right of your check-in button. Then, scroll down to the visitor fields section and to the right, add a field. Select the photo capture field.
The face detection feature requires a face be in view of the camera during the photo capture. If you have Returning Visitors turned on, then you can click on the lock icon to make the field "required" or "always required":
Please note that unlike other visitor fields, the Photo Capture field cannot be made "optional" to your visitors; therefore, the field cannot be skipped during the check-in process.
If face detection is turned on, and a face is not 'seen' within the capture window, your visitor will not be able to advance through check-in. They will see:
Please note that facial detection will not work if there is a light shining into the camera, such as a bright overhead light or a window behind your visitor that causes the camera to be unable to find a face. Try playing around with the tilt and location of your iPad mount to ensure it can successfully find a face, or you can turn off facial detection from within your button editor online. It's also important to remember that facial detection will not work if the visitor is wearing a mask.