From the Dropbox website:
Dropbox simplifies the way you create, share and collaborate. Bring your photos, docs, and videos anywhere and keep your files safe.
That pretty much explains why we use Dropbox for managing and organizing the content you provide.
We create a Dropbox project folder and share it with you so that you can easily manage your content from the comfort of your desk. Text docs, images, videos, links, logos and any other content that you’ll want to include in your fabulous custom WordPress website can be placed in the shared Dropbox folder through the desktop app or by signing into your free account at Dropbox.com.
If you’re new to Dropbox, you’ll need to create a free account before we can share a project folder with you.
Once you add it to the shared Dropbox folder, we can access your content, organize it (according you your instructions), and create a stunning WordPress website consisting of 5 pages and up to 10 posts.
If you’re not familiar with Dropbox and how effective it is to use a shared DropBox folder for managing projects, read more here.