Can you delete thumbnail files safely

I need to clean up for HD space.
FCPX GENERATES a lot of thumbnail files.  Can these be deleted safely, what can happen if I do?
Render files have not been a problem I know they render again.
Thanks,
AppleLou

Yes. The thumbnail files will be re-geerated the next time you open the project.
Just to say, however, that you should not expect  any more than very modest space savings. It's the High Quality Media render folder that typically offers the big potential for savings.
Russ

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