In this update, the ability to copy the Clearance settings along with Span Attachments you are Pasting in the Plan View has been added.
Since you have the ability to paste all attachments or just a category of attachments, the Clearance settings will only be applied to the Span if you are pasting all categories, or there is only one category to paste.
It is assumed if you are pasting everything into a span, you most likely also want whatever Clearance setting also existed in the copied span. In other cases it is assumed you just want the specific attachments added.