Hi Team,          We’re currently placing the file in the S3 bucket located in the US East region. In the event of an outage in the East region, will Adobe automatically pick up the file from a mirrored S3 bucket in the West region (assuming it's configured)? Just trying to confirm if Adobe has any ...

Yes, That is correct. 

Do we know why we get the below error An error occurred while calling the 'com.adobe.experience_platform.xdm_mapper@fallback' service for this request. Try again.