Today, as I uploaded a file to my drive and noticed this new popup window:
Apparently, I had already uploaded this exact file to my drive but forgot about it. Drive notified me that I already had a version of that file. It now will add it as a new version instead of duplicating the file. This is an interesting new feature. However, we need to be careful when uploading files of the same name. Luckily, in your upload window, you can choose to "Keep as separate file" if you just accidentally named the file the same. You could then go back and rename one of the files to avoid confusion.