With the printing surface face up, roll it lightly in the same direction as the image below.
The printing surface of glossy paper is shiny. Avoid touching the shiny side with your bare hands.
Release the paper. Make sure the paper is flat or only slightly curled in the same way as the images below.
Paper can easily become curled by the change in temperature and humidity. Store paper in its original packaging, and keep it sealed. Keep paper flat and away from moisture, direct sunlight and heat.