Most major inventions need a lot of available precursor technology, so it's actually kinda hard to think of things the Romans could have done if they only knew.
I keep thinking of a primitive printing press, but the Romans didn't have paper, either. Paper didn't appear in Europe before 1000 AD.
Actually it seems textile printing does have contemporary history. And maybe even older one. So jump from there to other materials might not be impossible.
Papyrus is also not a very good material for writing outside of arid areas compared to paper and especially parchment.
Unless kept in very good condition scrolls might last only a few decades. As far as we can tell many ancient texts were lost well before the Roman Empire declined because they weren’t popular enough for anyone to bother copying them.
Early engines were used to pump water out of coal mines because they were very inefficient and transportation was very expensive.
Of course Romans actually had coal mines in Britain and the Rhineland so it wouldn’t have been entirely fat fetched.