Facebook used to allow to attach playable videos to your posts. Facebook recently removed that ability. You can’t publish playable video along with the link to your site anymore. You can only post video with the link to youtube page and it will be payable.

Here is how to post with different URL:
https://www.nextscripts.com/snap-features/using-custom-urls-in-autoposts/

PS: Facebook made the change silently without any explanation or alternatives. We have no idea why or when (if?) that will be back.