Texture mips are split in to two large groups: streaming and non-streaming (aka "inline"). Note that "inline" is sometimes used as a verb to mean "load off of disk and place in our bulk data". "Inline" textures are loaded with the texture asset, and streaming textures are loaded on demand. Generally, 7 of the smallest mips are inlined, however some platforms pack a lot of mips in to a single allocation ("packed mip tail" = NumMipsInTail). Those mips must all be inlined.