The 3-click launch can only run in us-west-2

There is a limitation in Lambda where the code needs to be served from a bucket in the same region as the Lambda function resides. We currently have the default build code deployed in us-west-2 only which requires a deployment to be made there if you use the "Launch Stack" link in the README.

This limitation does not apply if you run your own development version using your own bucket.

Start with the README's "Launch Stack" link and trace where the default build code is deployed. Review the Lambda and bucket region constraint described in the issue, then determine how the launch path should make the default deployment available outside us-west-2. Done means the README launch works in another region while the own-bucket development path remains unaffected.

Written by the indexing model from the issue text.