If I'm not mistaken, now when you upload a short video to YouTube (from PC), it is put into a category called "Shorts". I have not found a way to avoid it and it seems that Xenforo in this case does not display the video directly within the posts, it only inserts the link.
Merhaba arkadaşlar, Eğer iOS uygulama geliştirmek istiyorsanız ve B4i kullanmak istiyorsanız bu videomda bütün sorulara yer verdim. B4i Tanıtım (macOS Olmadan iOS Uygulama Geliştirmek) adlı videomu beğenerek bana destek olabilirsiniz. Shorts:
www.b4x.com
You can add the shorts video to the topic, I did it here. I guess it automatically throws Vertical videos and short videos to shorts. If people discover it, it gets more views than a normal video. That's why Shorts is a little better