@subligula You might want to check out Tips on finding relevant topics. It’s always helpful to search for existing topics before creating a new one, as it helps reduce duplicate posts and keeps the focus on those who need help.
This particular issue has already been mentioned, and I’ve assisted with it here: Downloaded videos on IOS.
Based on that, I’ve created a GitHub issue for it, and I’m confident the Brave devs will investigate and work on a fix: