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When setting up HTML5 videos on a page how can you display an image (a still from the video) on the published webpage instead of the circular play icon that ipads and mobiles display. The video looks okay on desktop as it shows a still from the video.

You can use the 'poster' option to add a still image.

Thank you for your help.
You might have pointed me in the 'poster image' meaning.
I managed to work it out but may help other people to explain how to do it.