When you go back to watch the video. They all (except President Trump) walked away up the stairs with the document they signed last. Isreal had a black one. The other two countries had a red one.

They aren't really folders, they are those booklet things that you see when the President signs EO's and holds up to show the press. It reminds me of a book with a single page and a fancy cover.

^I would like to add this picture was a snapshot of the absolutlely historic peace agreement between USA,Isreal,UAE and Bahrain.