Auto-play option is greyed out on my video block

Me: I'm Paul, a SQSP user for >18 yrs & Circle Leader since 2017. I value honesty, transparency, diversity and good design ♥.
Work: Founder of SF.DIGITAL. We provide high quality original extensions to supercharge your Squarespace website. 
Content: Views and opinions are my own. Links in my posts may refer to my own SF.DIGITAL products or may be affiliate links.
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Would you like your customers to be able to mark their favourite products in your Squarespace store?