Sometimes, people delete photos on different apps or on their devices. They may not want the photos at the time. However, later, the people may want those photos back for some reason, but they deleted them. However, there are ways to retrieve these deleted photos. In most places, you can access the trash can as long as you have not deleted everything in the trash can. The trash can stores the items for future disposal.
Sometimes you can uninstall and then install the app again. This will cause a prompt to come up about restoring the things that you requested to be deleted. You may retrieve just about anything that you have deleted as long as you have not emptied the trash.