Fuchsias are a shade plant here too. I think the shock of the temperature change kills them but I'm really not certain. I can treat geraniums like houseplants and they do fine. The fuchsias immediately drop all their leaves. Most people let them go dormant or semi-dormant and store them in a cool place, maybe 7-10 C (45-50°F), but I can't provide that. And you know I'm going to try again anyway. :-)
In my reading today, I discovered that flowering ceases when temperatures reach 24 C (76°F) but I think it was the heat/humidity combination that stopped the flowering this summer because it was dropping buds that were about to open.
It's possible that the heat and humidity was an issue. Why not grow it all year round indoors, with your Amaryllis?
My fuchsia was planted outside in the ground and got hit hard when we had a couple of nights in minus territory. I took it out of the ground and put it in a pot, convinced it was a goner. It's resprouting from the base
I doubt it could handle our winter dryness. My amaryllis goes outside in summer.