How to upload files on the site?

Uploading a file - that  can be found back in the Library (Commons > Library) involves the following steps:
  1. position yourself in the library page
  2. expand the 'Upload and New Folder Options'
  3. select a target folder, where you think this file sits best
  4. click Browse and select your file at 'Upload a file to target directory'
  5. click the 'Upload' or 'New Folder'