: Tools like Doctopus use "Supplemental File S1" folders to help distribute classroom materials to students.
: In some cases, Google Drive may create hundreds of folders starting with "S-1-5-21" during synchronization with Windows 10; these are standard security identifiers and not related to intentional user content.
The most frequent context for this specific Google Drive folder is as a manual distribution point for Anycubic Kobra S1 printer firmware.
