Troubleshooting OneDrive Connector
The OneDrive Connector has a custom log in the Logs folders under the installation target A Target is a "pointer" to a specific instance of a search application, such as Elasticsearch.
 - (A Search application instance has one or more indexes) location.
        
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By default, the logging level is set to
INFO. - 
                                                    
If you want to troubleshoot, set the log level to
DEBUGin the Logging.config file in the installation directory. - 
                                                    
The OneDrive connector does not retrieve 'hidden' properties for the items crawled.
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If there are properties which you want to include from this category, they must be listed in web.config under "ListOfHiddenColumnsToInclude".
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A complete record of the 'hidden' properties which have been ignored are listed in the connector Logs, when setting the Log Level to DEBUG.