Steven Zahm@ Meghan
Apologies for the late reply! It seems I’ve been overlooking a few email notices for a few support topics.
1. This one is tricky. Honestly, probably the easiest thing to do would be to enter the extension in the suffix field in their name.
2. No, there are no print CSS files being loaded. That is something you would have create.
3. The CSS is editable with the Plugin Editor, however, since it is in a subfolder, it may not show up. Personally, I use the WP Editor plugin to replace the plugin and theme editors. It is much easier to work with, so I recommend giving it a try.
As for editing the CSS file for templates … those would be overwritten during an update. I suggest adding any custom CSS to the theme’s custom css area if it has one. The My Custom CSS plugin is a great little tool. You might want to give it a try.
I hope that helps!