Videos won't show on the timeline but the audios do. They were there yesterday when I was building the video, but today they are not visible. Videos are .mov., Dell Laptop is Inspiron 5570, Intel Core i7, 12 GB RAM, 64-bit operating system, x64-based processor. Videos (and the project) are all on an external Seagate Backup Plus hard drive that has 1+ TB space available.