Not sure about the M3 Pro, have not hade a reason to yet. But I have flown the original Mavic Pro in -20f. It is key to keep the battery warm until your ready to start the drone. Then lift up about 1-2 feet and let it hover for a minute or to and...
Check Drone Valley's custom cable. He has a video if you want to know more.
https://www.amazon.com/gp/product/B0DV44XS2R/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1
I have order twice from DJI, they use DHL which goes thru Custom in Cincinnati. Sat for two week and was returned to China. Called the customs office and was told all are being returned due to Child Labor.
I found Drone Nerds, they have their...