I want to create a plugin for Cinema4D SDK, I have a few questions regarding it.

1. Can I have an audio input field in my plugin where user can import audio?
2. Can I manipulate the timeline from plugin (like adding an audio to the timeline from my plugin)?
3. This one is not related to the above two. I want to add custom boxes like asset boxes in my plugin panel, where I can show 3D object. When a button is clicked from the plugin, I want to capture the 3D object being rendered at the moment in the app's canvas and show that 3D object in my plugin's asset box.