Q.I Had My Hope Sellonum In The Garage And We Had A Bad Winter Storm. Temps Fell Into Single Digits. I Brought Inside The Next Morning.
Will it survive? How should I care for it now?

Certified GKH Gardening Expert
Your only hope is that the roots didn't freeze and it will grow back. Try giving it some water and wait a few days and see if it bounces back at all. If the top growth gets slimy and soft, go ahead and cut it back. Here is more:
https://www.gardeningknowhow.com/plant-problems/environmental/how-to-treat-frozen-plants.htm
https://www.gardeningknowhow.com/houseplants/philodendron/split-leaf-elephant-ear-philodendron.htm
https://www.gardeningknowhow.com/houseplants/philodendron/pruning-philodendron-plants.htm