What do we got here?

I’m trying to download the video, but something like this pops up

Help me.

Contact the instance admin.

That actually Cloudflare limiting your domain. Turned out Cloudflare only allow serving HTML content. Since you are serving files, in this case videos, they disable that ability.

Your only choice now is to either change to disable Cloudflare proxy (which will expose your IP), or use object storage.