Odd. It should allow you to access them.
Have you tried moving the files, on the phone itself and not attached to the computer, out of the program's folder? It should allow them to be removed. It should give you the option to remove or delete the files, which remove means to move them to another folder. Unless there is an error with the phone, which wouldn't be shocking. However, this requires you know the password or have the fingerprint needed to access them.