Getting no "clicked documents" on kendra

Hello. Is there anyone used aws-kendra-sample-app-master, kendra react app sample codes by AWS? https://docs.aws.amazon.com/kendra/latest/dg/deploying.html

I DL & worked on it bit and it's basically working. Now we've been using it few days, but thing is on Analytics page, I see "0 clicked documents". I also used "Search indexed content" app on AWS console and clicked some pages, but still "0 clicked documents".

I've checked configuration on index and data source, but there's nothing relevant. I went through many documents on kendra and read codes in aws-kendra-sample-app-master, but can't find anything so far.

How do I do to get right "clicked documents" info?

Thank you.