Your site isn’t using meta tags. which is basically looks like this.
<meta property="og:title" content="Title">
<meta property="og:description" content="Description">
<meta property="og:image" content="http://example.com/thumbnail.jpg">
<meta property="og:url" content="http://example.com/index.htm">
Google about meta for learn in details and how to use.
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solved How To Display Images Preview and Title When I Paste in Another Site Like Facebook, Whatsapp, etc