When uploading files having the same to a folder in Alfresco, the platform renames that new uploaded file (including "-1" and so on counters) and creates a new file. 1: Folder > Test.pdf 2: Upload Test.pdf to Folder 3: Folder > Test.pdf, Test-1.pdf 4: Upload Test.pdf to Folder 5: Folder > Test.pdf, Test-1.pdf, Test-2.pdf This addon provides a behaviour to auto-versioning the existing file with the content of the new one.