Modifying a file is something else than what you normally do when you change a file. In this case you change something about the storage of a file. Remember we stored the first version of this document with the TUTOS revision system? Now let's modify this document and upload a newer version of the same file. We click on the 'Modify ' option and will see a screen similar to the one in the next picture.
The modify document screen
As you can see, there is now a clearly documented option to choose from. One is to simply overwrite the current document (called 'some document') with the new file. Or we can 'save the current document as version 1.0' and upload a new version while we change the version number. We must not forget to select the newer file with the 'choose' button otherwise no file will be uploaded. After have done so and clicking on the 'Enter' button a screen is shown similar to the one in the next picture.
The document details screen
As you can see there is also mention of an older version of the file. Clicking on this one will start the download of the file.