I'm trying to do vertex type blending using substances in UDK. For some reason I can't seem to assign an image to the image input that I built into the substance. The input shows up, but nothing happens when I try to assign a texture to it. https://dl.dropboxusercontent.com/u/9194933/UDK/TestCube.fbx…
Your image must be imported in UDK as a Substance Texture Input, not a standard Texture. Use the Import button in the content browser and choose Substance Image input as the file type.