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 video has no figcaption
Fabio Murru
"Any captions present in the source article must be preserved.
[...]
If the image has no caption, but has meaningful text in the alt attribute, you may use that text as the caption"
https://instantview.telegram.org/checklist#6-2-4-captions

If a caption is present in the source have to be preserved.
The second phrase implies that even if a caption isn't visible can be used, even the alt attribute.

This site uses a JSON that describes the various object used in the page, for videos exists the object type "VideoObject" that also contains a "name" that is always used as the caption for videos, and in most of them is showed at the top.

You have simply found a player that doesn't show it directly.
At most it could be optional to support since is not visible, but it's content present in the source.
Look at these screenshots:
https://prnt.sc/n9bhox
https://prnt.sc/n9bhd3
Declined by admin
Type of issue
Author added their own content
Reported
Apr 8, 2019