Hi Anwar,
AltaVault saves the cloud connection details of the cloud you connected to when you set the appliance up for the first time - this is then stored in the configuration you export and import. In this case, the US GCP location. Even though you've moved the data to the Asia GCP bucket location, AltaVault or the AltaVault you set up for DR will be attempting to connect to the US GCP location. It does not support connecting to a different location once it is initially set up. This likely means that there is a problem accessing the US GCP data location from the AltaVault you're using (in Asia?).
Unfortunately there is not a mechanism (via community support) to change the cloud target details once set. However, supported AltaVaults can engage f ormal NetApp support to address a cloud change mechanism like this depending on the setup (although it's highly unusual and considered on a case by case basis). Since you're doing this as a test, it's likely they won't support it. And in general, you should not have to move your data across geographies from a cloud provider perspective since your AltaVault can do that for you.
Regards,
Christopher