Private trackers or groups may ask for "paper" (often a photo of a piece of paper with your username written on it next to your physical media or equipment) to vet new members or uploaders.
The phrase in the context of scene releases (like "ANDOR S01E05 German 720p WEBDL") typically refers to a request for proof of identity or affiliation with a specific release group or private tracker . ANDOR S01E05 German 720p WEBDL
In the world of online file-sharing and "the scene," this often means: Private trackers or groups may ask for "paper"
Occasionally, it refers to the .nfo file or accompanying documentation that provides the technical specifications of the video encode (bitrate, audio codecs, etc.). " this often means: Occasionally