xbvr was just a suggestion as a better alternative to putting the video on your headset. Ignore that part for now.
But also, xbvr does not mean you are tethered to your pc, using xbvr your headset is connected to your computer only by wifi, and streams the videos from your computers hard drive to the quest headset.
Here is a useful link for xbvr help.
https://discuss.eroscripts.com/t/xbvr-guide-host-your-own-video-funscript-streaming-with-images-previews-and-more/129740
I would think very few people ever download videos directly to the headset, as the headset has very little memory and the videos are huge - I have hundreds of videos on my computer (terabytes of storage) that I stream to my headset.