Placeholder sample

func collectionView(_ collectionView: UICollectionView, performDropWith coordinator: UICollectionViewDropCoordinator) {
        let destinationIndexPath = coordinator.destinationIndexPath ?? IndexPath(item: 0, section: 0)
        coordinator.session.progressIndicatorStyle = .none
        
        for item in coordinator.items {
            let itemProvider = item.dragItem.itemProvider
            guard itemProvider.canLoadObject(ofClass: UIImage.self) else { continue }
            
            var placeholderContext: UICollectionViewDropPlaceholderContext? = nil
            
            let progress = itemProvider.loadObject(ofClass: UIImage.self, completionHandler: { (object, error) in
                DispatchQueue.main.async {
                    if let image = object as? UIImage {
                        placeholderContext?.commitInsertion(dataSourceUpdates: { (placeholderIndexPath) in
                            self.imagesArray.insert(image, at: placeholderIndexPath)
                        })
                    } else {
                        placeholderContext?.deletePlaceholder()
                    }
                }
            })
        
            let dropPlaceholder = UICollectionViewDropPlaceholder(insertionIndexPath: destinationIndexPath, reuseIdentifier: "PlaceholderCell")
            dropPlaceholder.previewParametersProvider = { (cell) in
                                // Configure your placeholder cell here ...
                                // e.g: guard let placeholderCell = cell as? YourCustomPlaceholderCollectionViewCell else { return nil }
                                return UIDragPreviewParameters()
                            }
            placeholderContext = coordinator.drop(item.dragItem, to: dropPlaceholder)
        }
    }