When I import OBJ file with texture image of transparent png and red background I can see the color of red is correct when in Solid Preview mode.
But once I switch to material or rendered preview mode where I would expect to see the image with red bg all I see is the image with pitch black bg - why?
In fact I am just testing if the OBJ file is OK (it is OBJ I made, generated by the Blender 2.8), cos it does not show texture in UE4 where I want to use it (so now I know the info about the texture is correct and something else is wrong with the UE4, but that is another topic, of course).
PS: I would like to have a solution without using of NODES, if possible.