It is missing a newline (enter) at the end of the last command there.

Generally, opening the folder of png files instead of the FSC is not that a good idea. All the settings for the symbols are in the symbol catalog file. The folder only contains the raw images. This means that the symbols won't automatically go to the right sheet, settings like collections and random transformations won't be used, smart features won't be available, and the origin point may be different than the symbol. Not all of this is equally important for every symbol, but generally, opening the folder should really only be considered for cases where there are no symbol catalog available.

You are using the wrong drawing tools for the style. The map you are making is in the Overland Mike Schley style, but your drawing tools have been set to overland CC3. Change the drawtools style, and it will work as expected.

The reason this happens is that fill styles are defined in the template, and those drawing tools are trying to use fill styles not defined in your current map, because they weren't made for that one.

(If you really want to use those drawing tools, check this FAQ entry.)

My keep right here is essentially a multi-floor perspectives map (needs some zooming in):

Do note that it can be pretty confusing handling the floors. While it is perfectly doable, Perspectives itself doesn't really know what a floor even is, it just works with surfaces. It is up to you to position those floor surfaces to make the illusion of floors look right.

No, there is no way to specify that. My approach would be to use the node edit tools instead. Now, you can't do this with them either, but you can easily calculate node positions to make this possible.

This is based on the fact that if you add a new node between two nodes, you are basically adding a triangle to the landmass, defined by the lines between the two old nodes and the new one. And the size of said triangle depends on the position of the new node, and can be calculated doing a bit of trigonometry.

Same if you remove a node, you are basically removing a triangle from the landmass (or adding one actually, if you are adding or deleting a triangle to the total depends both on if the angle is acute or obtuse, as well as if you are adding or removing a node).