On the right, you can see the interface that appears when you select the action Extract Topics.
There are five elements in the interface: Type, Language, Relevance Filter, Max number of topics, and User Dictionary.
Depending on the value selected, an additional field will appear to include either the text or the URL to analyze.
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There are four different fields in the output of the Extract Topics action:
In the next image, you can see the results of testing this action in Zapier: