In any attributes you add citations and notes and you can add these attributes to clipboard… unless for sources and citations attributes.
3 questions about Sources & Citations Attributes:
Q1: Why Sources & Citations Attributes doesn’t have the same fields (citations and notes) like every other attributes elsewhere? What do they have special?
Q2: Why these attributes can’t be shared with any clipboards (regular or collections clipboards)? Even in Source or Citation View?
Q3: It’s more a request than a question: Is it possible to have an attribute filter in Citation and Sources Views?
(Edited to (I hope) clarify this topic)