- > The **Prefix Filter** property allows Event Grid to only notify the workflow when a blob is created in the specific path we indicated. In this case, we assume that files are created by some external process in the folder specified by **<path-to-data-folder>** inside the container **<container-name>**, which is in the selected storage account. Configure this parameter to match the location of your data. Otherwise, the event is fired for any file created at any location of the storage account. For more information, see [Event filtering for Event Grid](../event-grid/event-filtering.md).
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