Material not appearing on model in UE4

Hi guys, I made a rock in Blender and tried to apply a snow texture to it. I used “Mark seam” to unwrap the model, and export it into Gimp to edit it. In Gimp, I just import the texture, and merge two images together to apply the texture. But when I use this texture to create new material, and apply it to my rock, the texture does not appear correctly, it showed all white color instead. I did the same thing to the default rock in Unreal engine, it appeared correctly. Can some one tell me how to fix this issue?
Here are the screenshots

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That Message doesn’t look like it has a material applied to it are you sure there’s a material on the static mesh?

I just solved the problem, I didn’t export the unwrapped mesh. But thank you for you help tho : )