You missed captions for medias. Check with my template.
"6.2.4 Captions Any captions present in the source article must be preserved. This includes captions for the cover image and captions for all individual elements of slideshows.
If the image has no caption, but has meaningful text in the alt attribute, you may use that text as the caption. ... "
this page isn't generated anyways because of too big videos. other pages use a different format for captions
Accepted by admin
Type of issue
IV page is missing essential content
Reported
Feb 17, 2019
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"6.2.4 Captions
Any captions present in the source article must be preserved. This includes captions for the cover image and captions for all individual elements of slideshows.
If the image has no caption, but has meaningful text in the alt attribute, you may use that text as the caption.
...
"