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Scenario:
You have a CSV file that only updates one document, even though it contains multiple rows that match other documents within the CSV. Multiple documents were supposed to be updated, but only the first one was updated in the file.

Can StorageRobot be configured to update multiple documents from a single CSV file? 

Answer: 
By product design, Index files are only meant to be used on 1:1 ratio. A single CSV file cannot be used for multiple documents. 

KBA applicable for both Cloud and On-Premise Organizations.