Unable to select specific edge in edge selection mode

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In the video, I selected Alt+right click first layer (edge) and it can be selected but, second layer/ edge isn’t, while other edges can be selected. The solution I need would be trying to find a way to select the edge without manually selecting the vertices one by one.

You can’t use the loop selection… because it’s not a loop.
These n-gons interrupt the continuity.
In this particular example, you can:

  • select the central disc (Face mode)
  • extend the selection: ctrl + Numpad plus key
  • convert that selection into a boundary: Select / Select loops / Select Boundary loop