In transferring data from an old PC to a new one, a lot of files and photos were inadvertently loaded onto the C drive. They take up an enormous amount of space and I would like to move them to another drive--either onto the D drive, or to an external drive. With Windows 7 and previous versions, it was simple--I could create a folder in the target drive, open and expand both drives and move the individual files from the old folder to the other folder. It was previously possible to show both expanded drives side by side, and the transfer was simple and quick. I cannot figure out how to make that work with Windows 10. What am I missing?