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I am trying to add video into my store via admin product edit page. I have already added a youtube api key but when i click on Add Video button than nothing happens.

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When i check the error log than its showing

main.CRITICAL: The element 'gallery' already has a child with alias 'content' {"exception":"[object] (Magento\\Framework\\Exception\\LocalizedException(code: 0): The element 'gallery' already has a child with alias 'content' at /var/www/vhosts/demo/vendor/magento/framework/Data/Structure.php:611)"} []

Thanks for your answer in advance.

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