I don't know, I would say that a magical force that cause objects to attract is quite a substantial gap.

How is it any more magical than, say, magnetism or fluorescence? It's not. You attempt argumentum ad ridiculum. Just because it's not fully understood yet does not mean that one day we won't understand it as well as we understand things like electricity today.

I never said it is, but it seems unreasonable to demand an explanation of the UA if one for gravity cannot be given.

With our current gravity knowledge we can calculate the force of gravity at any given height in our planet. In fact with that knowledge, I can calculate what is the potential gravitational energy of a given body, and with that potential gravitational energy I can calculate how much of that energy I can transform in kinetic energy.

That is exactly how we can create and harvest the energy from water by building Dams. Because we know exactly how much potential GRAVITATIONAL energy that body of water holds. And what is the percentage of that energy we can actually concert in electricity.

That is how much understanding of gravity we have. Stating we don't understand gravity is ignorance.

Now, is it possible to calculate how much potential energy a Dam has using the UA mathematics?

Do the FE apologists have any understanding of how UA works in a basic mathematical level?

Are there any UA math that can predict the behavior of a given body at a certain height?

Well, I don't think so.

Unless UA can be explained mathematically, we can certainly conclude FEers have no understanding of what UA actually is.