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These are a bit sensitive to bright light and cool temperatures. The most common cause for leaf drop is too much sunlight. They need to be in an area that is bright, but is not receiving direct light. This article will help: https://www.gardeningknowhow.com/ornamental/cacti-succulents/portulacaria/growing-elephant-bush.htm

I have an alocasia just like that! It is a wonderfully easy plant to care for. The flowers won't last too long, but they are self fertile. Once the pod starts to split after the flowers drops, then you can plant the fresh seeds immediately. If they dry out they will no longer be viable to grow. You won't have to do anything until the flower starts to die, and the seed pod swells.

This will not go away on its own. You can use copper fungicides, although many plants are very sensitive to these. So I would test it on a small area before hand to make sure. I actually recommend a much more gentle method. Dolomitic lime and wettable sulfur will kill off the infection, as well as recondition the soil back to a more fertile condition.

Copper fungicides can make the soil very toxic if used improperly. You will need to follow all instructions very carefully, and remember that you will be working with a poison. Each manufacturer can have different instruction, so just be sure to read them carefully.

This could be uneven watering, lack of humidity or even a pest issue.
Assess the plant care with the articles below.

https://www.gardeningknowhow.com/ornamental/bulbs/elephant-ear/growing-elephant-ear-plants.htm
https://www.gardeningknowhow.com/ornamental/bulbs/elephant-ear/elephant-ears-taking-over.htm

This article should help:

https://www.gardeningknowhow.com/ornamental/bulbs/elephant-ear/growing-elephant-ears-indoors.htm

They are supposed to arch and zig zag so I would leave it. You can trim it up a bit to shape it.

https://www.gardeningknowhow.com/ornamental/cacti-succulents/elephant-tree/operculicarya-elephant-tree-care.htm