The photo was used to build the model, but I also performed UV projection on the model and exported it as FBX. But the texture was not exported, how can we solve this problem。

[Robintjhb]

The photo was used to build the model, but I also performed UV projection on the model and exported it as FBX. But the texture was not exported, how can we solve this problem。
photo：

A simple model established after blending projection：

Export fbx format model without projected texture ：