You can get scanners with automatic document feeders that will take one image after another. Scanners, with backlights, will scan several slides/negatives at the same time as separate images. I am not aware of a scanner that will automatically save several photos/documents that are scanned at the same time. I have placed several small photos on a scanner, previewed them and selected an individual photo in turn.
OnePlus 5T review: Hands-on