Quick look and pdf

Since migrating from a 2015 iMac to a 2019 iMac, my pdf’s and QuickTime media no longer show a thumbnail preview or can be previewed using Quicklook. Is there some preference file I need to trash to reset Quicklook?

Try clearing the cache.

I appreciate the response. I gave that a try and still no previews for pdf’s or quicktime files. Any other suggestions?

Issue cleared up after latest Mac OS X update.