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Read more Button for a textfield

Hi guys hope you are all doin well.
I tried to create something like a read more link under two lines of text and with a click on that read more it should expand. So I found this in a forum:

http://sandbox-903b9c.webflow.io/blog-posts

But I don’t find the interaction and there is no custom code in the page setting.
Can someone explain me how this works :blush: ----------

Thanks for the help and stay healthy.

Here is my public share link: LINK
(how to access public share link)

I found it! It is a legacy interaction.