I have two shapes: a cylinder and a rectangle which I want to connect in order to make a fillet betweem them. I know how to do this in Part Design, but I need to make it in Shape Design. When I try to use the Join command I get an error message. I have highlighted the edge I want to fillet in the screenshot. Please help :)
You need to use Trim command before fillet.
Just trim rectangular fill surface with cylindrical surface.