If you find that AirDrop is not working at all, not discovering other Macs or iOS devices, or AirDrop won’t find a particular other device or Mac, try this out, it will almost certainly resolve the issue and discover the AirDrop target.
How to Use AirDrop Compatibility Mode Between New Macs & OS X and Older Macs
You must start this process from the new the Mac that has a later version of OS X.
1. Open a Finder window and choose “AirDrop” as usual on the new Mac to attempt to search for available AirDrop devices and Macs, assuming it’s an older Mac you’re looking for it won’t show up at all
2. Click the small text question “Don’t see who you’re looking for?”
3. A little pop-up box will appear saying “To share with someone using iOS, ask them to open Contro lCenter and turn on AirDrop. On a Mac, ask them to go to AirDrop in the Finder.” – click the “Search for an Older Mac” button underneath this text
4. Wait a moment for the older Mac and OS X version devices to appear as available AirDrop file sharing targets
Now you can use AirDrop to share and copy files back and forth between Macs as usual, and the new Mac with newer versions of OS X will also appear on the older Mac with older versions of OS X.
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