Since there were at least 4 other people in the meeting, I presume they established the existence of the document through testimony from the others. But Trump was not charged with sharing classified information, probably because they didn’t have the actual document. Not having that document does not impact any of the charges listed in the indictment, so if you were hoping that would result in a dismissal of charges, you are setting yourself up for a disappointment.
The entire case is a politically driven farce. If you are getting your hopes up of a conviction, you are setting yourself up for disappointment.
The same goes for any hopes this would damage Trump politically.