I did read it and I read it thoroughly, but as I previously said I do not really understand what every comment means and even if I do understand something it does not mean I also know how to fix/change it.

In any case, all my attempts to make the macro work on the main document have failed, I am not receiving any errors and nothing changes within the document. However, I also lack the knowledge to debug this properly.

Do you have any ideas what can cause the macro to not do anything without an error?