Why does the printing effect of the Xiaomi Portable Photo Printer 1S photo paper become worse after being stored for some time?

The print quality can be affected by the storage conditions of the photo paper. It is recommended to store the photo paper in an environment with a temperature between 15℃ and 32℃, and the storage humidity should be from 40% to 55% RH. Do not store it in places like excessively hot, humid areas, or locations exposed to direct sunlight. If the storage of the photo paper does not meet the conditions, it will lead to issues like inconsistent print quality, paper jams, paper removal errors, or incomplete prints.