Temporary files during video export

Hi!When I run the video rendering, I see the free space on my system drive decreasing. After rendering is complete, free space is returned. I always export video files to an external SSD. The cache of all my FCPX libraries is also always located on an external SSD. I do not launch any other programs during rendering. What other files are created by FCXP and what directory are they in?

If you locate your final cut pro library and control click on it, you can select "show package contents". From there you will see a variety of files and folders including the library database, settings, Motion Templates folder and others. If you then click on any event folder, you will find additional folders which may include a render files folder, analysis files folder, shared items folder and your original media folder (which will be actual media if you imported directly into the library, or it may show links to media if your library uses external media). It's best not to move or modify any files within your library at the finder level as this data is all managed by Final Cut Pro, but you can check to confirm certain data is present by the procedure mentioned above.

Thank you for your answer. I know about FCPX libraries, so I follow them. Libraries opened in FCPX do not grow in size. But the free space on the system disk decreases.