Updating the default image used when content is shared on social media is a simple change within the MediaStorm Toolset. To accomplish this, first navigate to the 'General Tab' of the release and click 'Choose Image'.
Next, Select an image from the media list prompt and click 'Accept'. Once you do, the chosen image should now populate the Social Media Image section
This image will now show when posted on social media (Facebook for example)
If you wish to customize the image that shows when a specific section of the release is shared, you can do this via the 'Content' section of the release. For more on the Content section, click here.
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If you wish to double check what is being shown when you post this release on Facebook, navigate to Facebook's debug page. Next enter your URL and view the results. Hit 'scrape again' if you want to do a manual refresh to recache the new information you have added.