Video Thumbnail in public share

How can I show a thumbnail of preview on my shared videos on a public share? It is only blank like this:


I have preview generation working on my files but when I shared it on public links, it is black.

Same with different browsers?

Which OS?

Which NC version?

Yes, different types of browsers. PC and Mobile. Nextcloud 22.1.1 version.

Hello, anyone who happens to have the same problem with me?

It’s only enabled for a few data types by default: