>>277672641
Dropbox is the easiest. Upload mp4 video, copy public link into video player world. If you don't have h264/aac video, or need subtitles, use handbrake to transcode beforehand.
>>277672852
Google drive won't work, doesn't serve the raw video bytes.

If you're watching stuff by yourself, you can run a local http server and paste in a localhost url into vrchat. Avoids having to upload if you don't have good bandwidth.