Ungroup job is a default Switch app that, in combination with assemble job, provides a way to keep track of files that belong together while they are being processed separately.
Ungroup job injects all files from a job folder into the flow as separate jobs. After these files have been processed through the flow (and possibly were renamed), assemble job can reassemble them into a new job folder with a structure similar to the original one, with provisions for injecting additional files and for dealing with incomplete jobs or orphaned files.