Webdam, Widen, Bynder, MediaValet, Brandfolder, PhotoShelter, are six examples of cloud-based DAMs that will take you much further in a creative workflow than Dropbox or Box.
All six benefit from a Silicon Connector providing true URL-based linking. As David mentions, we have a unique solution that makes cloud-based workflows very effective with InDesign:
https://siliconpublishing.com/products/products_connector.html
While we have yet to build such a connector for Dropbox (I’m sure we will some day), we do have one for Box:
https://siliconpublishing.com/products/products_connector_box.html
Dropbox and Box both work great for exchanging files, yet both are limited in terms of true asset management and robust support for creative workflows. While we do offer connectivity to Box that is used widely and improves lives of designers, when people ask us “tell us how Box is the best solution for creative workflows?” we tell them honestly, no, choose a cloud DAM. We’d say the same about Dropbox.
Once I asked the Box COO “hey, you have an awesome storage system, why don’t you add the 15% more functionality you’d have to in order to make it a functional DAM?” and he replied “hey when you have 20 million users” (this dates me) “you find yourself ruling all sorts of niches you know nothing about.”