The Dropbox for Gmail extension doesn't interfere with your ability to add attachments from outside of your Dropbox folder. For that, you need to use the standard Gmail attachment button.

That's it! Now, whenever you right-click on a file or folder, you can just click Send To > Dropbox and it'll appear in your Dropbox folder.

Dropbox Dropbox can also be accessed through any web browser, its desktop app, or the Dropbox mobile app. You can upload files of any size with Dropbox, and you can drag and drop files or folders ...