if the user clicks the share link from the mobile, it will always show this domain name m.vk.com and the rest of the video name will be the same right?

If yes, can you try to download my attached file then replace this file with the following file location on your site and see how it goes?

JoomlaFolder/administrator/components/com_easysocial/includes/crawler/hooks/vk.php

Hello. I replaced file and now it works fine (can add video with m.vk.com and vk.com). Thanks.

if the user clicks the share link from the mobile, it will always show this domain name m.vk.com and the rest of the video name will be the same right?

I don't remember. I just copied link from URL field (in browser).

Alright, keep us updated if your site user still encounters any issues when they share vk video links on the site.