You loaded UVs to a mesh and then you created a new mesh based on the vertices, edges, and polygons of the source mesh and forgot about the UV Maps. Currently, Animation Nodes doesn't provide access to UV data through nodes, so you will have to use some python expressions.
You can get a list of UV Maps in a mesh using the
getUVMaps() method, each element in the output list is a tuple of two elements, the name of the map and a 2D vector list representing the locations of the UVs. To set a UV to a mesh you can use the
insertUVMap(name, uvs) method, which takes the name of the map and a 2D vector list.
So, in conclusion, to transfer the UV maps from some mesh
sourceMesh to another mesh
targetMesh, we can use the following expression:
([targetMesh.insertUVMap(*map) for map in sourceMesh.getUVMaps()], targetMesh)