Textures Not Associating Themselves with R21 Preset Library

Hi, Doc.

I’m trying to create a material pack for distribution.  In the past, I’ve always created a New Preset Library in the Content Browser.  When I would drag a material with texture maps into the preset library, a “tex” folder would appear and it would store that material’s textures.  I’m following this same process in R21, but when I drag a material, no “tex” folder is appearing.

Can you please tell me what I’m doing wrong or what I need to change so that the textures link with the materials?

Thanks!