https://instantview.telegram.org/checklist#6-4-2-video-audio-from-unsupported-players 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. If it is not possible to represent the widget as an iFrame, but it is possible to get a direct link to the video/audio, use this link to generate a <video> or <audio> with the correct src attribute. Otherwise, mark the object with the @unsupported function.
So should be marked only if have no iframe version
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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.
If it is not possible to represent the widget as an iFrame, but it is possible to get a direct link to the video/audio, use this link to generate a <video> or <audio> with the correct src attribute.
Otherwise, mark the object with the @unsupported function.
So should be marked only if have no iframe version