I think the OP's concern was that they couldn't upload G-Code, they could only upload PDFs. And because PDFs don't encode circles, a mechanistic translation to

I think the OP's concern was that they couldn't upload G-Code, they could only upload PDFs. And because PDFs don't encode circles, a mechanistic translation to G-Code can't convert it into a G-Code circle, only a curve that emulates a circle. So... you know... note to self... when designing a laser cutter, allow the user to upload G-Code.