Some texture files in City Sample such as T_Brick_PackedB contain 30 individual 4k textures when exported.
(1) Is there a name for that kind of texture file?
(2) How can we identify that kind of file? The only way I see is by file size and that they have extreme resolutions like 40,000x40,000.
(3) How could we reduce those 30 files to 2k and then reimport them into a single file again?