Fitbit /strava syncing - help!

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I am very untechy so dont normally record my run times. I am doing a challenge to run 30 miles between 26 Dec and 6th Jan. I have to upload all the evidence at the end. I have a Fitbit Charge so can record each run, but i dont know how to retrieve the information once my watch has gone back to normal setting, and i am very good at knocking it off the run record settting before i can take a pic of it. I have signed for Strava but that stopped shortly into the run due an error! I linked my fitbit to the strava account and it initially showed this mornings run, but now i cant see it! What am doing wrong? I dont want to lose out on a medal because i cant prove my miles!