not sure what happened, but all my background videos and MP4 autoplay embeds that worked perfectly before on mobile, randomly stopped autoplaying. Instead show the big play button on mobile.
I haven’t changed the video at all. Not sure what is causing this. I’ve republished multiple times.
But maybe your OS has changed and/or your browser version (mostly the browser, I mention the OS because the browser version change with an OS update).
Not so long ago, bg videos and autoplay videos were not possible on mobile, because it draws such power from the device. The past two years it gradually became possible.
What OS and what browser are you testing on, and what’s the page on which you experience this?