Steps to reproduce
Export a document to PDF using the latest version of the Dynalist desktop app on Mac OS 10.14.5
Spotlight indexes the contents of the file
Spotlight cannot identify detail (i.e. words) within the PDF.
With the PDF open, I’m unable to highlight text with my mouse to copy/paste, so guessing it must be the way the PDF is rendered by Dynalist. If my mouse can’t identity words, I doubt Spotlight can either.
Hope this makes sense!