Yes, you can control how this works by using the "mode" parameter when uploading files. That mode value should be a WriteMode. One of the write modes is "overwrite", though "update" is reccomended, as it's safer. With "overwrite" it's easy to accidentally/unintentionally overwrite new changes you didn't mean to.
We love to learn from the educators who use Dropbox. Whether you teach kids, teens, adults or a combination of all three, we want to know what apps and integrations you use with Dropbox to help with teaching. Which of the ones below is your favorite, or most used tool?