Include files vs old information

Hi there,
I´m a graphical designer that worked with DW. Now I´m trying “Wappler” and like software but I feel lost with all the information that is available but is outdated. I believe no one uses old version of Wappler. Why not differentiate this old information.

In this tutorial from 13/09/2020 on the minute 7:55 de “Include file” is presented like a good solution to create a template for a static website in HTML

https://www.youtube.com/watch?v=pYUqTm72xLE

Example: When I try to use the “Include file” it doesn´t work… like in the video. Any update solutions for this question?

P.S. Why not create a badge or a colour for old information that doesn’t apply to the last available version of “Wappler”?