I have added new Data Source from Appian Admin Console.
The connection is good and works fine in our Maria DB SQL Tool,
but we cannot see in the Appian Cloud Databse site.
How can we see it from within the Appian Cloud Database site?
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The cloud database site will only show the default business data source that comes with the cloud installation, so it isn't possible to show additional databases through that UI. If you connected to any external databases, you must view the data from that external tool.