Just to let you know Yosemite is not compatible with android phones. Before upgrading I was sending a lot of files and pictures to my Mac via Samsung Galaxy Note 3. After upgrading I've tried many times to set up my android under Bluetooth Preferences...even shutting off both laptop and phone. Message will show "connected" then after a minute will "not connected". My mouse works. Today I spoke to an Apple support agent and we tried the same plus holding down 4 keys after shutting off. My Mac Air still doesn't recognize my android phone. He said it seems that Yosemite is not compatible with my android phone and recommended sending files/pictures by email. Very inconvenient!