Setup - Create an Object Relations class

1.Login as admin on administration interface
2.Click on Setup tab on top menu
3.Click on Classes on left menu
4.Click on Content on Class Group block
5.Click on New Class button
  Name : A Media Class
  Identifier : a_media_class
  Object name pattern : <name>
6. Add a text line attribute
  Name : Name
  Identifier : name

7. Add a Media attribute
  Name : Media
  Identifier : media
  Media player type: Html5 Video
  Max file size: 3Mb
8. Click on Ok button

Add a new object

1. Click on content structure, from the top menu
2. Click on Create New and chose A Media Class from the drop-down list
Name: Movie

3. Click on "Choose..." button
4. Chose a file bigger than 3Mb
5. Click on "Send for publishing" button