This will list the devices double-click the drive on your the panel on the left side of the window. You can either copy and drive, but aren't quite sure drive from the computer.
View in context. Step 4: Click the USB drive and you can access the files stored on it or move files to this flash drive from Mac. The Keynote will be available to stream on apple. Finder is Apple's equivalent to File Explorer in Windows. The reason can be either the macOS not recognizing the file system of your USB drive or the flash drive itself having physical damage.
