icon overlay to thumbnail

Hello,

Thank you for contacting Rank Math and bringing your concern to our attention.

The watermark you see on BBC is generated not as an icon but as an image that they uploaded specifically for social media sharing. You can do the same by simply adding a watermark to your images as mentioned in the guide below:
https://rankmath.com/kb/watermark-for-social-sharing/

The icon option will only allow you to insert an icon for example a play button to make it look like it is a video.

Here is an example of what it looks like when you select the video play icon:

Note: You’ll need to purchase the PRO plan of us to enjoy using these feature.

Hope that helps, and please do not hesitate to let us know if you need our assistance with anything else.

Thank you.