cannot use airdrop after updating OS to el capitan
i have updated OS to el capitan, then i cannot use airdrop to share file, and i have tried a lot of ways to activated again, but unsuccessful.
kindly advise.
Mac Pro, Mac OS X (10.4.11)
Is your Mac Pro at least an early-2009 model (model# A1289) with an AirPort Extreme card? Are you trying to use AirDrop with another Mac or with an iOS device (iPhone, iPad, or iPad Touch)? If to another Mac, what version of OS X is it running?