How could I control the flow of this fluid?

I am a blender beginner and after watching some tutorials online I figured I’d give modeling and animation a try.

I am trying to make an oil hourglass animation that will move the liquid downwards. The hourglass is exactly the same as the one shown here, I also have a physical reference of it.

The only issue is that my liquid doesn’t seem to want to pass through 2 holes I made on the container mesh, I suspect it’s because of the wrong facing normals right outside of it:

Images of the mesh

I managed to get the liquid to flow inside of the top sphere, but It won’t flow into the rest of the mesh.
Will I have to create a new mesh? Help is appreciated, thank you!

Here is the .Blend file