Updating Fields linked from Excel

Hi Folks

I'm trying to insert text and objects (ie. tables/figures) from Excel into Word via "Insert Content" (Rich text format and Excel Objects, respectively; with the option "Insert as Link").
This works fine, as long as the Excel source file is open. However, when the source file is closed, Word will complain.

I've been following the instructions of a Youtube video where exactly the same procedure obviously worked without having the source file open (https://www.youtube.com/watch?v=kz8VgfWbDr4).

Any ideas?