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Adding a cover image to video shortcode

I'm looking for a way to allow the user to add a cover image (a.k.a. thumbnail) to an internal video, uploaded to WordPress and embedded with the shortcode [video]. So far everything I came up to is ...
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267 views

Gallery Shortcode Function Help

Okay, so I found this code online that allows you to add the option of how many thumbnails you want to show in the gallery shortcode. The code below is what they say to add to the functions.php file ...