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As per the latest (Summer 20) update, salesforce introduced the after-save event for flows.
As per the order of execution salesforce https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_triggers_order_of_execution.htm
Before-save flows run before "before trigger". But the documentation doesn't mention anything on when after-save flow runs, or I'm missing something?