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 #1

This page should be supported. Unsupported iframe is just a widget showing a title/description/cover of another article on this site. RelatedArticles do the same thing, so it can be converted into that.
Dinozaur
there is no more pages like that with this embed (type "blockquote" in search bar and check it, this site supports this type of search), it's one-page thing.
Type of issue
IV not generated for target page
Reported
Mar 14, 2019