To display file icons on thumbnails in Windows 11, open the File Explorer Options first. Then, switch to the View tab and find the Display file icon on thumbnails option. next, tick the ...

What are Brown Box Icons overlays? Learn how to remove these brown box icons on file thumbnails in Windows 11 Desktop.

You can use the macOS Finder's Copy command to copy and paste files. But here's how to use the same command to copy file icons into Preview.