Wölff wants to simplify the migration of your images to the Catalog ;).
On the Web
Select multiple images by dragging your mouse cursor or by holding down the Shift key and clicking multiple images:
On iOS (very similar)Tap multiple images from those stored on your local device (the images you select are designated with checkmarks):
Enter the art object's metadata only once (on the right half of the screen), and scroll through each image (on the left half) to add any specific iconographic information and/or photography credits: