The current Meraki-specific requirements for NetFlow are as follows:
Dashboard must be configured to communicate with a NetFlow collector, not a flow exporter.
The collector must support NetFlow version 9.
There are a number of server options available for NetFlow collection. Cisco Meraki recommends configuring an "ELK" stack, referring to a combination of the services ElasticSearch, LogStash, and Kibana to provide parsing, data storage, and visualization.
Please refer to your NetFlow collector's documentation for configuration specifics,this articleprovides an example ELK stack configuration.