PNG exported with transparency enabled, but no transparency

From Libreoffice Draw, when exporting as png, it offers the option of saving with transparency. However, I have not got it to work.

Although there are discussions from several years ago, I can’t find any recent updates on this issue. How does one properly enable transparency on exported png images?

What do you want to export? Is it a drawing, that you have created, or an image, which is embedded in the document?