if the prints are made in the south, they should be molded as much as possible. Because the air in the south is humid, the air in the north can be dried without molding. Of course, it is easier to preserve after molding. It is no problem to keep the printed photos for decades.
photos are molded to be easy to rub when they are hung on the wall for a long time. If they are stored in an album, there is no need to be molded. Some albums have plastic films, which will stick to the photo film after a long time.