It appears if someone uploads more than 25 documents to the engagement (25 is the default view), when you click the box to download all documents, it only downloads the first 25. For example, if there are 27 documents, but only 25 are in view, when "selecting all" , only those 25 will be selected.

(Note, if you change your view to view 50 for example and then check the ‘select all’ box it will select the 27)

Can the default be when you check the ‘select all’ box – it selects to download all documents on all pages in the engagement and not just number of documents in your current view?