Unity Secendary Maps

Hi! How I can input albedo2 to secendary maps in Unity shader? When I drag and drop it into material, it not saves it. Each time I click out of my material, the secondary maps go away. I saw some old topic on this forum: https://forum.substance3d.com/index.php?topic=7824.0 ,but the answer in there, was to create another substance, which in my case it misses the point. Because every change I have to do twice. Is there some changes in this area last years?