Why is the clause "They filled me in on all the latest news from Cambridge" correct?

Why is it not like the following:

They filled the latest news from Cambridge in me.

Solution 1:

To fill in is very similar to “to fill” – the “in” is an adverb that gives the nuance of putting something into an empty space that should not be there so that there is no longer a blank or a hole or an empty space.

For example, you can fill in a hole in the road by putting stones into it; you can fill in an official form or a question sheet by putting writing into the empty answer boxes.

”To fill in”, in the sense you ask about, is an extension of this idea. They put in (= add/insert) news about Cambridge that you lacked and so the fill in the missing part of your knowledge:

“They filled me in on all the latest news from Cambridge” – They added news so as to fill in the news that I was missing.