The versions of a file

Uploading a file with the same name into the same folder creates a new version: the previous one is kept. Right-click the file, then Version history:

1. 1The current versionthe one everyone opens and downloads, with the person who uploaded it, the date and the size.
2. 2Preview and Restorethe eye opens an old version; Restore makes it the current version of this file again, without touching the other documents.

Replacing a file does not change its author: it stays credited to the person who uploaded it the first time.