Rule 3.1346 Service of motion papers on nonparty deponent

If you want to force someone who is not a party in your case to answer a deposition question or hand over documents, you must personally deliver the court papers to that person. You cannot simply mail the papers or send them electronically unless that person agrees to receive them that way.

The person's agreement to accept mail or electronic service must be on record from the deposition itself. If they did not agree to that during the deposition, you need to show up and hand them the papers in person.