...
When you deploy a Self-managed Snaplex in your UAT Org, you need to add those Snaplexes to the IP Allowlist to allow communication outside of your network, if outbound requests are restricted. Contact support@snaplogic.com or your CSM for more information about Managed and Self managed Snaplexes.
...
New features are generally available every month. Snaplex updates are available quarterly, and a UAT version of the new Snaplex version is available a week ahead of GA. You can test new features during the months in between the quarterly releases without action. Only during quarterly releases do you have to update the Snaplex nodes in your Org with the new Snaplex version. If the customer enables Snaplex auto-update for the UAT org, then no action is required to update the org
Test Snaplex Versions and Snap Pack Updates
...