This is a problem that has plagued Adobe generated files for YEARS. It is very disappointing that this is not a priority for Adobe to solve since lacking the ability to view thumbnails of files is a major inconvenience and slows your ability to work as swiftly as you need.

Thumbnails and previews of Adobe generated files, in particular PDF files, do not appear in folders in Windows 10. Lacking the ability to preview a file often times requires users to open multiple files just to be able to view it. Now, what is interesting is that if you uploaded these very same files to Dropbox the thumbnails appear. Hmmm. Whatever technology Dropbox is using to preview thumbnails should be easily copied/used by Microsoft.