I suppose there's an error in the STL file, have you checked and repaired the file? https://makeprintable.com/ is a good free tool for this.
Netfabb is also a really good free tool for inspecting / measuring / fixing STL's.
My guess is that your part is just too thin. Try scaling it up and seeing if it shows up in the sliced views.
Even if you would succeed in printing this in one shot, it is likely to break when removing the supports, due to the very thin items, and since they are printed in the "wrong" direction, not along the layers (like wood cut in the wrong direction, instead of along the direction of the fibers, is also very brittle).
If you can edit the model, it might be worth trying to split it up in several parts: railings apart, stairs apart, etc... And then print each part flat on the bed, without supports, and glue them together. Like the model railroad houses we built as kids. This would cost you less material, less printing time, and probably look better and be stronger.
Check x ray mode to see if there are errors with the model shown in red.
What is the diameter of the hand rail?
And what sized nozzle are you using? A 0.4 diameter cylinder won't be sliced if you use a 0.4 mm nozzle, the cylinder needs to be slightly larger, like 0.45.
So set your nozzle size to a smaller size and see if it works.
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