Problem to use Factory symbol on perspective

Hello, I would like to use symbol factory on perspective:
On VISION, I have drawn a component using shape->difference.

But on perspective I can't find option shape->difference.

Where did the Perspective tank image come from?
What file format is it?

The obvious thing to do would be make the centre transparent.

You mean I have to make the background color transparent ?

The image came from factory symbol

and CylindricalTank is a perspective component