Disk fills up with files in the C:\Windows\temp directory.
Files created by Dynamic Step & Repeat and Dynamic Marks tickets in Automation Engine, that might include the input file and temp files with the file name starting with Enf_, are not removed from the system.
These files are located in the C:\Windows\Temp directory.
This problem is likely to be fixed in Automation Engine 14.
The PDF files can be manually deleted as they are not deleted when the task is deleted from Pilot. The temp files should get cleaned up when the task is deleted in Pilot, unless the task is cancelled. Wait until all tasks are finished and then delete all the files whose names start with Enf_.