Hello and sorry for my english 
I have problems causing the terrain texture.
As terrain i use box mesh, and my own custom texture, I’ve painted in photoshop.
So the problem is that when i import texture, it shows strange way in Unreal in play mode. Strange squares(pixels?) appears on it. I draw all by my self using pen tablet. and all those squares should be lines)
When i just start to paint few days ago i tried to import small part of texture, and it was ok, with no squares.
I use PNG as import. And the image resolution is around 6k
After this problem i tried to import all formats but the result is same.
If anyone can help me, this will help me a lot.
Thanks you.