The Instant View Editor uses a three-column layout, so you really want to use it on a desktop screen that's wide enough. Sorry for the inconvenience.

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Issue #2

There is cover video(unsupported) on source page which you converted to link. But cover suitable cover image also available class="thumbnailUrl"

It's obligatory to use main images as cover:
https://instantview.telegram.org/checklist#6-2-2-cover-images
Falko
Using the thumbnail of the video as a cover is not obligatory. I would even say it's a bad idea, because the checklist says the following: "The cover must not be set if the cover image is duplicated in the article", which I would argue is the case here because the thumbnail is a frame taken from the video.
About videos themself as a cover: "While it is possible to use gifs and videos as cover, in most cases, it's better to leave these elements in the body of the article."
Type of issue
IV page is missing essential content
Reported
Apr 2, 2019