How do I do this = I just tested by searching for something unique using HoudahSpot and did not turn up this pdf on my iCloud == is it because I need to force Spotlight to index iCloud?  Or something else?  And if the first, how do I handle that?  I really need to have the iCloud able to be indexed so I can use Houdah Spot.  Thank you.
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Spotlight does index iCloud.  In HS, add ~/Library/Mobile Documents to your search scope.  That searches the content of PDFs in iCloud Drive. 

I am running macOS 10.15.4 and I am NOT using Optimised Storage (i.e. my Desktop and Documents folder are not stored in iCloud).  Your experience may well be different with other versions of macOS.
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