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In the first image, ‘Ball’ and ‘Floor’ (Platform) are classes and have blueprints in them which make them behave a certain way. I dragged both into the scene so that when I select either of them and open the level blueprint, I can add a reference to them. As you can see in the second and third image, where it’s required to ‘Get’ or ‘Set’ the Floor/Platform, I just get a ‘Cast to’ option.
But you have a ‘Current Platform’ which you are able to ‘Get’ (4th image) and ‘Set’ (5th image). So how did you make that possible? I think that seems to be the only reason the blueprints aren’t working. Or if you spot anything additional, please let me know.