I understand orientation.

I’m asking you to explain to me how the world can be moving ‘up’ for everyone at the same time unless it’s flat.

As an extreme example, how can it be moving ‘up’ for someone on the North Pole and someone on the South Pole at the same time.

Just to avoid confusion I do not think the earth is flat, it’s demonstrably a sphere and I can’t tally that with your assertion that when you drop something it doesn’t fall down but the earth moves ‘up’ to meet it.