I currently have some problems using the preview pane in File Explorer where if there is a # in the name of the file, it does shows an error. When I remove the # symbol, i am able to view the file again.
The error that I get is
File not found
It may have been moved, edited, or deleted
The version of Adobe Acrobat Reader DC is 22.1.20142. Windows OS versions that I have tried on are 10.0.19043.1766 and 10.0.19044.1766. Uninstalling and reinstalling Adobe Acrobat Reader DC temporary fixes the issue, it always comes back after a few weeks.