<video controls playsinline autoplay muted class="w-100 h-auto" poster="/wp-content/uploads/2020/03/image-name.jpg" src=" /wp-content/themes/theme-name/assets/video-name.mp4#t=0.5 "></video>
The #t=0.5 makes it start at a certain time, which also gives it a poster image, so adding the poster image won’t be necessary. Unless you want a specific one.
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