iframe support to embed to files in cloud storage (e.g. onedrive...)
I couldn't tell if iframe was supported (example: <iframe src="https://onedrive.live.com/embed?cid=F2A6434F807CE5F6&resid=F2A6434F807CE5F6%21115463&authkey=AAjniHLdBgWFVIU&em=2" width="476" height="288" frameborder="0" scrolling="no"></iframe> )
iframe support brings some security issues, and we probably not ready to address them soon. So probably iframe won't be supported, consider using links to the corresponding documents.