I've got a file sitting in a folder within my Documents that Windows search is unable to see. I've searched for the title of the doc, I've searched for a phrase within the doc, it cannot see it.
I've navigated to the specific folder that it is located in, so that the file is visible on the screen, done the search, it still cannot be found.
I also tried modifying the file today so it has new Modified date, search still cannot find it.
Indexing seems to be working since other files that I've created since this file do come up in a search. And I created a file today and searched for it and it is found. So search is mostly working, just not for this file, and perhaps an unknown number of other files.