Support inserting plain content or cited content when inserting documents

Is your feature request related to a problem? Please describe. The user is requesting a feature to support inserting either plain content or content with citations when inserting a document.

Describe the solution you'd like A clear and concise description of what you want to happen.

Describe alternatives you've considered A clear and concise description of any alternative solutions or features you've considered.

Additional context Add any other context or screenshots about the feature request here.