Hello,
Thank you for contacting Rank Math and bringing your concern to our attention.
You can add your default Social Image on your WordPress dashboard > Rank Math > Titles & Meta > Global Meta > OpenGraph Thumbnail.
Here’s a link for more information:
https://rankmath.com/kb/titles-and-meta/#open-graph-thumbnail
Also, please ensure that the image file format you are uploading is only between jpeg, gif, or png, and the image resolution is as close as 1200 x 630 pixels as per Opengraph Standards.
I hope that helps.
Thank you.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.