how to associate news feeds to respective record in a record type?

Scenario: 

Need to show any system events or user updates on a record. Using a Record Type with list of records. Each will have news tab in it. Tried using both Post Event Feed and Post System Event but none of them are showing news in this tab for respective record as soon as it is created or updated. There is no trigger from related actions, as expecting an event to be posted in news tab as soon as a record is created in DB as shown in below screen shot.

Please advise how to configure.

The record tag is =a!toRecordIdentifier(cons!NSA_AllAssets_RecordType_Cons,pv!nsaRequest.Id) as shown in screenshot. 

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