J
The example I gave that showed it working was from Affinity Designer. I used symbols. There was no need to convert the rectangle to curves.
Although Affinity Designer is my main app, I'm trying to use VectorStyler more since VectorStyler has more tools, some of which I find quite useful. For example, I like how VectorStyler has "center text on baseline." Affinity Designer doesn't have that tool, so I have to manually align the text.
But VectorStyler is a lot more complex, so there has been a bit of a learning curve.