If you need to view the file sizes on a Cisco UC filesystem (e.g. Communications Manager, or Contact Center Express), you can execute the following command:
admin: file list tftp * detail
To sort the list by file size, execute the following command:
admin: file list tftp * detail size
To view files in a subdirectory by size:
admin: file list tftp/Desktops/640x480x24 detail