Can anyone tell me how to find out if a form submission was received by a paid search or organic search? How do I create a segment for paid search? Do I need to apply Search engine = paid or paid search = paid as part of the rule in the segment?
If you do, you can break down all form submissions (however you have this tracked: event, pageview, etc.) by the last touch channel. This would tell you, of the form submissions, how many came via natural search, paid search, etc.
If you wanted to create a segment, you would use the same dimension, i.e. visits or hits where the last touch channel = paid search.