A. 1. Use the 'Add to Cart' option for each photo individually, and ensure you are confirming each addition. 2. Organize your photos in albums or categories to streamline the selection process.
B. 1. If the app allows, create a batch order by selecting multiple photos at once before adding them to the cart. 2. Consider using a desktop version of the service if available, as it may offer a more user-friendly interface.