No image when sharing website link to WhatsApp

Hi Zakra Theme Support,

so far you helped me to solve all my questions! Thank you so much!

I have another quesiton. When sharing my website link on WhatApp no thumbnail image is shown. If you take for example Amazon.com and share their website link on Whatsapp there is always a picture appearing. If I share a link from my website in Whatsapp its not the case.

Can you help me to solve this problem.

Thanks a lot in advance.

Kind regards

Markus