You can upload your files directly to your Oculus Quest 2.
To do this, you need to connect the Oculus Quest via a USB cable to your PC. Then, after starting deovr, you go to local files, open your video folder and watch.
You can also install on your PC Plex Server DLNA and add your library to it. Then you can watch files through DLNA without connecting your headset to your computer. After starting DeoVR player - click search for DLNA servers in the network, select your own - and you will see in it all the videos that have been added to the Plex Server media library (Your computer and Oculus Quest must be on the same local network. Your router must allow traffic between the wireless connection and LAN connection).