I built a deck and it is only showing up on the lower level in floorplan. How can I make it show up on the first floor too? It looks fine in perspective. I had to draw a box just to show that there's a deck.

[NAD4091]

[TeaTime]

A deck is simply a room, just drawn with railings and set as a Deck room type. It's only going to show where its walls(deck railings) were drawn, like any room.

Probably the most direct way of literally displaying them on other floors though is to use Reference Display. Probably make a custom Reference layer set just for Deck layers, though this may be a lot of work without a ton of payoff. I feel when I need to show them like this, just outlining it with CAD as you've done is usually sufficient in most cases. And it avoids confusion of someone maybe thinking there's a deck on both floors.