The following applies if you are using a version of the software before Update 19. The system temporary file locations can fill up with failed or abandoned Web Client upload files, which may affect Web Client performance by filling up valuable disk space. You have to manually delete these files from these file locations.
From update 19 and onwards, Server Manager uses the existing DaysBeforeCleanup file service site setting to also remove failed or abandoned Web Client upload files from the temporary directory locations and free up disk space. You can configure this file service setting to clean up the upload file temporary file folders more frequently. For more information on the site setting, see File Service Settings node properties.