He's moving the mouse while holding Ctrl to click on files. Ctrl+Move == Copy. So as he's trying to select the other files, he's actually copying them each time he moves the mouse while clicking.

A new Windows 11 feature makes it easier to move files around your system. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.

Another update just rolled out to Windows 11 Insiders that brings new features like jump lists for apps pinned to the Start menu and the ability to share files from the Windows Search panel, reports ...

Linking your Android phone to File Explorer does exactly what you’d expect: your smartphone files are listed within Windows File Explorer, seamlessly integrated alongside regular PC files, OneDrive, ...