I see that you used birch wood for the fire. Birch is a fantastic fire wood. And used in almost every Norwegian wood stove for heating houses and cabins. But then it has been cut, split and stored to dry for months first. Because while birch bark is a fantastic tinder, the birch, even dead standing that you find out in the woods will be full of moisture. This is beacuse the bark is very air and water tight. So thet the wood inside never dries out. Instead it it just rots, until it fall over. Punk wood from birch is almost always full of water, like a spunge. you can actually squezze water out sometimes.
If it stays in the fire long enough it will eventuealy catch fire, but it's not really worth the effort. So if you can try to find spruce or better, pine. Or any other wood than birch. But if there is no alternative, try and find a dead birch that has been de-barked by a moose or the weather. It's likely that it will be dried out, instead of spungy rotten, and then frozen.
else , nice trip report and I envy you the trip