Preview plugin questions

I am working on a internal plugin to preview content from attachments within a post. Could you please help me with the following questions:

  • What is the proper way for a plugin to serve JavaScript / CSS assets for a preview <iframe> that is going to be displayed after the attachment link?
  • Is there a plugin API to access attachment contents directly instead of accessing through HTTP(s) to bypass the dreaded XHR not allowed error? Can we access the controller directly to reuse it?
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