Individual files in an interview can only be deleted by the person that originally uploaded the file, or the License Manager. In both cases, the user must be the custodian of the interview.
To delete any file, open the interview card and locate the attachment that needs to be deleted from the list of files below the video player.
Hover over the file in the list, and a 3-dot menu will appear on the right of the file.
Click this icon and you will see a "delete" option in the menu that appears. Once you click "Delete" it will ask you to confirm that you want the file to be deleted.
If you'd like to delete multiple files at once, you can click the check boxes to the left of each file that you'd like to delete, and then click the small trashcan icon that appears at the top right of your list of files.
If the license manager or the original uploader of the files is not the current custodian of the interview, the interview will first need to be transferred to them, and then they will be able to delete any necessary files.