How can I add an image to a form that then acts as a sharing image on Linkedin?SOLVE
The image should be added to the page that the form resides on. The protocol is called Open Graph ( https://ogp.me ). Once you add your code you can test the page via the Facebook Sharing Debugger ( https://developers.facebook.com/tools/debug/ ) or Linkedin Post Inspector ( https://www.linkedin.com/post-inspector/ ). Then you can confirm how your page will look once shared.