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> )
AdminKirill Maximov (Admin, Checkvist) commented
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.