Axure is pretty fickle with SVG files. The source needs to be pretty clean and simplified… When masks, unions, filters used it can look pretty funky in Axure.
For what it’s worth, I tried downloading the “settings-outline.svg” file from that site and while loading the SVG directly in my browser worked fine, all I can see in Axure RP editor is a blank 512x512 SVG widget. When I converted to shapes, I got this error:
So, I guess you could send this file to support@axure.com and see if they have an answer.
I tried a few others… None of the “settings” icons worked (Filled, Sharp versions) but the basic ones like “add-outline.svg” did work. I can open “add-outline.svg” in Illustrator, see and edit it, but “settings-outline.svg” in Illustrator just shows one layer with what looks to be a blank path.