Create and manage File Groups and what Extensions make them. These are pre-configured with most options that you would want but you can add to this.
Select Add New File Group.
Enter a name for the group within Label.
Enter the relevant extensions for this group within Values.
To edit a file select the Edit (pencil icon).
This will open a pop up.
You can edit a name for the group within Label.
Add or remove extensions for this group within Values.
To delete a file group select the Delete (Trash can icon).