AirDrop for iPhone SE and MacBook Air

Make sure your iPhone and Mac are connected not only to the same SSID but also the same band (2.4 vs. 5 GHz). Some routers will not bridge the necessary multicast traffic between the different bands.

Additional troubleshooting steps (this assumes your Wi-Fi network is being provided by your router, which is true for most people)

1. Disable either the 2.4 GHz or 5 GHz network in your Wi-fi base station (router) so that we can force the Macbook and iPhone to be on the same Wi-Fi band.
2. Verify your router's firmware is up to date, and apply the update if one is available.
3. Look in advanced settings in router and look for settings like multicast filtering and make sure they are disabled—Bonjour requires multicast traffic to work properly

First, make sure your Mac is able to use AirDrop. The following Macs are able to use AirDrop:

MacBook Pro (Late 2008) or later, excluding the MacBook Pro (17-inch, Late 2008) MacBook Air (Late 2010) or later MacBook (Late 2008) or later, excluding the white MacBook (Late 2008) iMac (Early 2009) or later Mac Mini (Mid 2010) or later Mac Pro (Early 2009 with AirPort Extreme card, or Mid 2010)

However, AirDropping files between iOS devices and Macs requires a 2012 model Mac or later.

If your Mac does work with AirDrop and AirDrop still doesn't work, here are several fixes:

1. Reactivate Airdrop (on iPhone)

Go to Control Center on your iPhone (accomplished by swiping up from the bottom of your screen). Disable Airdrop and then enable it again. Make sure your phone is discoverable to all devices. Make sure Wi-Fi and Bluetooth are enabled. If it still doesn't work, try toggling the Bluetooth and Wi-Fi button.

2. Restart your iPhone and Mac

Restart your iPhone by pressing and holding the power button and home button at the same time. And you probably know how to restart your Mac.

3. Reset Wi-Fi Let both your Mac and iPhone forget your Wi-Fi network and/or password and reconnect to your Wi-Fi

4. Confirm AirDrop is enabled

Go to Finder and click on AirDrop in the sidebar.

5. Update

Update both your Mac and iPhone to the newest version of OS X and iOS, respectively.

6. Searching for older Macs?

Make sure your Mac isn't searching for older Macs. Go to the AirDrop page in Finder and make sure it's searching for newer devices (including the iPhone).

7. Confirm Bluetooth and Wi-Fi are enabled on the Mac

Turn on Bluetooth and Wi-Fi on the Mac. People often forget to turn on Bluetooth on their Mac in addition to their iPhone.

Hopefully, these tips will help you!