It used to be that when you scanned a barcode on a book, DVD, CD, etc. If eBay had a stock photo there was an option to use that instead of uploading your own.
I used to find that really useful and save a lot of time for items that are in new, nearly new condition.
Since the latest update it appears to be missing. It shows the stock photo when you scan the barcode but then does it actually list it in the photos And asks you to upload your own this slows down bulk selling a lot
How do you say you want to use the stock photo?