Apple takes on Dropbox, WhatsApp with upgrades

Apple has taken on Dropbox and WhatsApp with a series of software upgrades that mimic the rival apps' services. At its annual conference for software developers, the firm unveiled iCloud Drive, an internet-based storage app, which works on Apple systems and PCs. In an effort to keep customers using all its technologies, Apple improved integration for calls and messages across its devices.
Background:
Apple takes on Dropbox and WhatsApp with integrated apps [BBC]
Apple's big innovation at WWDC: Letting apps talk to each other [Forbes]