In the context of video files and online sharing, "paper" usually refers to one of two things:
If this is a digital media file from a specific creator or group, the "paper" is often an .nfo file or a text description providing technical details (resolution, frame rate) and production credits. Live Brazilian Wax.mkv
If this is an educational or medical video, you might be looking for the clinical study or instructional guide that accompanies the demonstration. In the context of video files and online