Windows 11/10 displays a file icon on the thumbnail ... Once it is opened on your screen, go to the View tab and find the Display file icon on thumbnails option. Tick this checkbox to enable ...

In Windows 10 and Windows Server 2019, it may happen that File Explorer does not display the offline file icons correctly. You can identify an offline file by the overlay that shows an “x ...

For the new icons in the File Explorer, you can't miss them ... You'll need to be on the Dev channel, so you can go to the Windows Insider Program tab in Settings to get started.