Image names should be saved so that the file name matches your inventory number (e.g., 12345.jpg would get assigned to item #12345 in your inventory). You can upload multiple images per item by appending an underscore and number to the file name.
Example: Book #12345
12345.jpg or 12345_1.jpg (Image 1)
12345_2.jpg (Image 2)
12345_3.jpg (Image 3)
... and so on