Yes. When you generate a preflight briefing by tapping the Briefing button at the top of the Flights view, ForeFlight stores the resulting briefing for up to 120 days. The briefing can serve as proof that you have met the required weather and NOTAM briefing regulations stated under 14 CFR 91.103.
NOTE: A briefing record will only be created if you initiate the preflight briefing by tapping the Briefing button at the top of the Flights view. Only viewing weather information on the Maps or Flights views will not provide the necessary record.