I am wondering if I can open the attachment which is attached to the father
heading in agenda view.

I think it will be very convenient to open as the way above,

and I really do not want to attach the same file to all of the subheadings.

I have turned on the inheritance of the properties,

 but it seems like that the subheadings does not inherit the attachment
properties.

Is there anyway to solve this problems? Is it a bug?