Generated library files are not deleted from Synology NAS

Deleting generated library files doesn't actually delete them on my Synology NAS.

What could be the issue?


The size doesn't decrease even though the original media is outside of the library and I check all the boxes to delete all content.

MacBook Pro 16″

Posted on Nov 21, 2025 2:14 AM

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Question marked as Top-ranking reply

Posted on Nov 21, 2025 6:31 AM

The FCP "delete generated library files" only deletes certain files. It does not delete analysis files. If you *carefully* inspect the .fcpbpundle in Finder via right-click>Show Package Contents, you can tell what is consuming space. If it's the analysis file folder, FCP, as currently designed, does not delete that -- whether on a local driver or a NAS.


If FCP does not delete render files after you do "delete generated library files" with all the checkboxes enabled, it really should do that. However in general there is no network-specific code in FCP for NAS cases. It issues the same filesystem I/O commands and the NAS is supposed to handle that. If your non-deleted files are render files, let us know.


If it is analysis files, that can only be deleted manually with Finder (which can entail some risk if you aren't proficient with such things) or with Arctic. I don't know what the Arctic support policy is for NAS-hosted FCP library files. You'll have to ask them.

3 replies
Question marked as Top-ranking reply

Nov 21, 2025 6:31 AM in response to Transforman

The FCP "delete generated library files" only deletes certain files. It does not delete analysis files. If you *carefully* inspect the .fcpbpundle in Finder via right-click>Show Package Contents, you can tell what is consuming space. If it's the analysis file folder, FCP, as currently designed, does not delete that -- whether on a local driver or a NAS.


If FCP does not delete render files after you do "delete generated library files" with all the checkboxes enabled, it really should do that. However in general there is no network-specific code in FCP for NAS cases. It issues the same filesystem I/O commands and the NAS is supposed to handle that. If your non-deleted files are render files, let us know.


If it is analysis files, that can only be deleted manually with Finder (which can entail some risk if you aren't proficient with such things) or with Arctic. I don't know what the Arctic support policy is for NAS-hosted FCP library files. You'll have to ask them.

Generated library files are not deleted from Synology NAS

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