Drawing cylinders in Stud.io seems to be easier than in other software due to the ease of using their hinge tool and how it interacts with connected pieces. The attached folder has some basic instructions and a straight wall ready to turn into a cylinder, a completed example and one of my modified cylinders. Included is a pdf with a table of angles necessary to use in the hinge settings to get a perfect circle of varying diameters.
https://www.dropbox.com/sh/fqxsw8vfzmrymwy/AAA__P_LbXweHJredEq4q81va?dl=0