For collaborative file editing
- Login to the page from the top right "Log in"
- username: demo
- password: demo
- Hover on the button "Content" on top of the page
- From the opened drop-down menu, click on "Media"
- You can see a document list has opened
- Navigate to a row with a document named "Drupal Demo Document"
- At the end of the row click on the little arrow pointing down
- From the opened drop-down menu click on "Edit in ONLYOFFICE"