I recently downloaded Hitfilm Express onto my Mac Mini. Every time I attempt to import footage it reads the message: "File Error" and the trimmer shows, "The media file could not be loaded. I have had no trouble viewing the footage in iPhoto, and have tried using CloudConvert to convert the files from .mov into other types such as mpg, mxf and mp4. All of my attempts have been in vain. What should I do?