If I pasted the below link into Gmail body then its showing a thumbnail of video with anchor links in mail content.

https://h-vd.io/KXK9Z15P? Watch Video

https://prnt.sc/pflxhqJZzikr

if I entered my link into Gmail body then it's not showing a thumbnail of the video.

https://www.vidconnect.net/page/120? Watch Video

please help me to solve this issue

Thanks.