AR-PE3 (serv.man9). ARPE3-Printing Guide - Sharp Copying Equipment User Guide / Operation Manual. Page 111

By default, each Hot Folder you create contains the following subfolders:

—the default location for storing all jobs that fail to process successfully. 

Problems at the print device might cause a job to fail.

—the default location for storing archive copies of all jobs that have been 

successfully processed; also referred to as the Keep Original Folder in the Folder 
Settings dialog box.

The file name of the archived job in the Move Folder has additional numbers at the 
end of the original file name to prevent jobs with the same file name from being 
overwritten. The 18 digit number at the end of the original file name is the year, date, 
time, and process id. The process id will increase by one if the user drops in multiple 
files at the same time.

—a private folder used by the Hot Folder while processing a print job.

You can instruct the Hot Folder application to store archive copies of job files in the 
Fail and Move folders. You can also specify alternative folder locations for archive files.