If your product videos are not showing on the front end of your Magento 2.3.4 website, it is possible that the issue is caused by missing thumbnails. Here are the steps you can follow to resolve this issue:
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@johnwebdes40a5 Thanks for the reply. The thumbnail is showing on the Magento admin panel, but missing in the front end. The file is missing in the cache folder. For example pub/media/catalog/product/cache/ab405fe287a88500015caa4cca8ea8b1/h/q/hqdefault_9_1_4.jpg
If the product thumbnail is missing in the front of your Magento 2 store and the corresponding file is not found in the cache folder, there are a few steps you can take to resolve this issue:
We had issues getting Youtube videos to play on product pages even though the API key was correct and the video was visible in the admin screens.
Turns out the issue was because the URL defined for the youtube video in admin was pasted by copying the "share" video link, and that has a domain name of youtu.be and NOT youtube.com
So if you are having trouble getting youtube videos to render on your pages (and you're not seeing the video URL when you view source code on the product page), make sure you define the video URL in admin by copying the address seen in a browser. Do NOT use the shortened URL's provided with the handy "share" function.