Drop interaction - handle data

func dropInteraction(_ interaction: UIDropInteraction, sessionDidUpdate session: UIDropSession) -> UIDropProposal {
  let dropLocation = session.location(in: view)
  let operation: UIDropOperation

  if selectedImageView.frame.contains(dropLocation) {
    if session.localDragSession == nil { // Drag come frome the app
      operation = .copy
    } else { // Drag come from a third app
      operation = .move
    }
  } else {
      operation = .cancel
  }
  
  return UIDropProposal(operation: operation)
}