We have an instance of discourse 2.3.5 running on Amazon.
We are moving to Bitnami on Google Cloud Platform.
I backed up using the builtin discourse admin backup tools. I download the tar.gz to my desktop. I uploaded the tar.gz back to the new Bitnami instance on Google Cloud. The archive successfully uploaded message is shown but says it may take a minute to show up in the list, but it never does.
I checked the normal home for the backups in the apps/discourse/htdocs/public/backups/default/ and nothing is there.
I will review your instructions.