Article with youtube embed. https://instantview.telegram.org/checklist#6-4-2-video-audio-from-unsupported-players "If the unsupported widget has an iFrame version, make it into an <iframe>. If you do that, the IV page will not be generated due to unsupported content, but things will work out of the box if and when we support that widget."
I saw, but it's too old, they're not using object/embed in recent articles.
Declined by admin
Old article
Type of issue
IV not generated for target page
Reported
Mar 11, 2019
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https://instantview.telegram.org/checklist#6-4-2-video-audio-from-unsupported-players
"If the unsupported widget has an iFrame version, make it into an <iframe>. If you do that, the IV page will not be generated due to unsupported content, but things will work out of the box if and when we support that widget."