Ah..
If the image is already included in the content, then the featured image seems not appearing on the top of amp pages to prevent duplication. Interesting. The custom editor is not a problem.
I hope to include the featured image even it is already in the article same as the mobile version of theme, twelve fifteen.
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This reply was modified 9 years, 1 month ago by Lamanus.
This is resolved after using the plug-in, which mods /category/issus base to just /issue.
