It's hornbook law that demonstratives are not evidence. Nevertheless, you'll sometimes see parties file some or all of them on the docket, if for no other reason than to explain a portion of the transcript where an expert is otherwise gesturing vaguely at a powerpoint.

Unfortunately, there's no rule squarely addressing when it is appropriate to lodge these demonstratives with the Court. Fortunately, Judge Hall gave us all a bit of guidance last week in Ferring Pharms. Inc. v. Finch Therapeutics Group, Inc., C.A. No. 21-1694-JLH, D.I. 494 (D. Del. Aug. 28, 2024).
In that case, both parties filed their trial demonstrative a few weeks after the verdict (via notices of lodging). Just …