: If the file was moved to an external drive, you might lose metadata visibility in some operating systems.
Right-click the file and select (Windows) or Get Info (Mac) to check the file size, resolution (e.g., 1080p or 4K), and date created.
: The .MOV extension indicates a QuickTime File Format , which is a multimedia container commonly used by Apple and many digital cameras.
: If standard players won't read it, try the VLC Media Player which supports almost all .MOV variations. Losing valuable .mov preview data - Apple Communities