Download and install CloudMounter.
Why use multiple Dropbox accounts?
To answer this question, we need to take a look at the primary reason people use Dropbox in the first place - to save space. Having multiple accounts ensures that you increase the free cloud space, saving more space on your local hard drive.
The second reason why people are eager to use multiple accounts is due to file management. Having one account for photos and a second one for videos is widely used and can help determine exactly where you want to log in. More than this, it can serve as a safety feature too, having all of your private information on a more secure account and then your family photos and ordinary work content on another one.