Alert user to take horizontal media

When photos are added to a field named photos, alert the user with a message if they're taken as portrait/vertical (where the width would be less than the height). For videos, we want to check the orientation property.

Note that using INVALID with add-photo or add-video media events prevents the media file from being attached to the record.

ON('add-photo', 'photos', function(event) {
  if (event.value.width < event.value.height) {
    INVALID('Please retake the photo in landscape orientation.');

ON('add-video', 'videos', function(event) {
  if (event.value.orientation == 90 || event.value.orientation == -90) {
    INVALID('Please retake the video in landscape orientation.');