How can I get the world position of the camera inside a camerarigrail to store the position inside a usd?

Hi, I have a sequence with a camera and a CameraRigRail, when I export this sequence in usd format, the camera always stays in the same position, only changing the rotation and focus values. The usd has a reference to the camerarigrail but for some reason it does not export the values (camera positions) ​​or the various points of the rail. Can you help me find a solution?