Can't use USB Flash Drive on Printer

I work in an office building that has a print shop downstairs.  I need to save a document on the flash drive and plug it into the copy machine/color printer downstairs.  I save the document on the flash drive - everything works perfectly.  I get downstairs - I can see the folder it was saved in, but no file.  It’s a brand new flash drive and I bought it specifically for this purpose.  HELP!!

When you go back upstairs and plug the flash drive in do you still see the file?  If yes then I suspect the system’s security app/s downstairs may be blocking your file for being unsafe. 

Are you storing the file to be printed in the SecureAccess system or next to it?