iOs Video Preload Issue
The HTML5 video element has an attribute loop that doesn’t work on iOS. That’s why the video shows black screen. In that case we have one solution. Please add Featured image in every video product & enable the Thumbnail Video Poster from theme Option
Follow the tree. Mayosis > Theme Option >Product Options > Video Grid Options > Thumbnail Video Poster . Enable the option. Then the featured image will load as a preload image.