If this testvar is not specified, CDRouter uses pre-built 10, 100, or 1000 KByte files for all upload tests. The length of the file used is determined by the testvar storageFileSize. This parameter specifies the full path of a custom file on the local system to use during upload tests instead of the included pre-built files. Specifying a custom file allows different file sizes and types to be easily tested. The maximum allowed file size is 10 MB.