Just in case anyone wants the video background to work on iPhones...and I'm presuming all the backgrounds have the same code.

Unlock the Pasteboard, select the misspelled Video Container placeholder and: Utilities > Web Properties > Placeholder (tab) > HTML code (body) and add the word 'playsinline' anywhere between <video and id= (top line should look like - <video autoplay loop muted preload playsinline id="bgvid">

Credit to my new friend ChatGPT.

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