Okay. The rocket on the left has no texture. The one on the right has a texture that shows up fine in the Blender viewport, but doesn’t show up at all for me in Unity. Still pretty new at this - what settings should I be looking at first?
There does not seem to be a texture attached to the material. Generally, I would recommend to design your materials in Unity, not in Blender. It might be that some imported materials do not work.
If you didn’t do anything fancy in Blender. Create a new material in Unity, assign one of the Unity standard shaders to it and assign your texture. Then assign the material to the mesh rendere in your rocket’s Inspector.
If you want to bring your texture from Blender into Unity you will need to bake images for the albedo and normals (or height) maps. And a create a combined Metalic/Glossy mask using the R channel for how Metalic you want it and the Alpha channel for the Glossyness (Note Unity measures the glossiness, not the roughness). Once you have your maps you can import them into a “Texture” folder which must be stored next to the “Models” folder and from there drag them onto the instance of your model.