Lightbox Link doesn't support social media videos

Hello Community,
I’m trying to insert a lightbox on my home page in which there are social media videos (Facebook, Instagram stories and videos, TikTok…)
But whenever I try adding the link on my lightbox, the error I get is :
Invalid embed type: link

Is there a way to add social media videos To a lightbox?

side question: does Webflow create a thumbnail for a video or should the thumbnails be uploaded separately?

Anyone has an answer please?