Does this look like how you would imagine a chimney fire from directly above?

When you say they don't show, do you mean they don't show up in the Symbol Manager, or something else?

If you have symbols from different folders that have the same name (eg Tree 01, Tree 02, etc.) you will need to rename one or the other of the duplicate-named symbols in the symbol manager (not the originals folder).

Please can you show us a screen shot? It's a bit difficult imagining the effect :)

You could easily do that within CC3 by using an RGB Process Matrix. Here is a very ordinary colour scheme turned bright red/orange by a single matrix on the whole map. I used the Unity predefined matrix and just knocked out the blue and most of the green - emphasising the red.

Another version that is probably closer to the colour. I used the first active matrix to turn everything grey, and the second one to turn everything a muddy pale orange. This is the result of the first matrix, followed by the result of the second one.

You can adjust them both to give various different shades, and maybe use one set on one sheet and another set on another sheet for different grades of orange-ness and brightness. I've just used the whole map setting for a quick result.

You're welcome :)

After a while you get better at guess-reading it. The only time I have real difficulty is if I need to be able to see the numbers for sure.