Store and Forward using Ignition Edge?

Hello! We are trying to test out the store and forward capabilities of our edge devices in the field running ignition edge.
The issue that I am coming across (possibly due to lack of experience) , is that the manuals reference using the main ignition historian or a SQL database, but our historian is located within OSI PI. We use an MQTT Broker that has a PI Connector that sends our Ignition Edge tags into PI.
What are the parameters to get S&F to work properly? How do others test to see if it works how it should? our PLC's are on fiber so would I just turn off the MQTT connection between the Moxa and the broker in order to test S&F??
I attached a simple network diagram.