Hello omninaught,
Can you provide us with more details, and one or two screenshots?
Default geometry that comes with UE will render the materials I assign them. A mesh I downloaded won’t render materials that aren’t a solid color. How to I get this mesh to render more complex materials?
Yes. So this is what I mean. Both have the same texture on them, but one is only showing a solid color that vaguely resembles the material
Have you UV unwrapped the meshes? it looks like the UV0 map, is either not existing or failed to import.
What kind of 3D software are using to create them?
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you’re beautiful haha thanks! I’m new to all this but that was a big help. Love this community
I’m glad I was of help. Sometimes it just needs a little pointer into the right direction. 
Regards, Vecherka.