Important note:

This is related to H5P as if you do the same test with an image, it works normally (the image does not appear in the unused files)

With Tiny MCE

Prerequisite:

• Tiny should be the default editor (if not go to Preferences/Editor preferences and change the default editor to Tiny).

In a course C1:

• Add a new Text area
• Insert a H5P activity (https://h5p.org/content-types/advent-calendar for example)
• Save the activity
• Edit it again and click on Tools / Manage File icon in the top menu.
• You will see that the H5P file is in both sections: 
  • The list of files used
  • The list of unused files

With Atto

Prerequisite:

• Atto should be the default editor (if not go to Preferences/Editor preferences and change the default editor to Atto).

In a course C1:

• Add a new Text area
• Insert a H5P activity (https://h5p.org/content-types/advent-calendar for example)
• Save the activity
• Edit it again and click on the Manage File icon next to the H5P symbol (see screenshot)
• You will see that the H5P file is in both sections: 
  • The list of files used
  • The list of unused files