Adding images to unit types

[Paradox 01]

I'm using V3.4b, 4th Edition WH40k (because it's the only one that still has VDR), VDR list. I'm currently using it to replicate Star Wars vehicles. I can't figure out how to give each of my designs their own image.

I know how to add images to basic unit types (I had to do it for Warmachine), but the problem I'm running into is that since each unit has the same basic Unit Type (VDR Custom Vehicle), whatever image I load gets added to ALL the units I create, whether it's an X-Wing or TIE Defender.

Help? Is this a bug, or am I just doing something wrong? I can upload image shots if I wasn't clear enough above.