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An aggregator is a special type of module which allows to merge several bundles into one single bundle.
The scenario below shows how to get photos and videos from Instagram, compress them to a zip archive, and send them to a selected Dropbox folder using the Archive module, Create archive.
The aggregator setting is done in the same way as the Module setting.
The only difference is that, first, you have to specify Source node; the source of bundles you want to aggregate.