Apple on Monday showed off the latest version of its Mac operating system, Yosemite OS X, which includes a Dropbox-like drive built into the Finder window that syncs content from apps running on Apple mobile devices; a “mail drop” feature for sending big files in email, and more continuity between Mac and iOS devices. Some icons, windows and utility apps have also been redesigned in the new OS. The company’s senior vice president of software engineer, Craig Federighi, appeared on stage at annual Worldwide Developers Conference to demo Yosemite. Finder windows, sidebars, and the dock now have a “translucent” design, so users can see their desktop wallpaper through windows. Some native app icons have been redesigned. “You wouldn’t believe how much time we spend crafting a trashcan,” Federighi said.