With iOS9 Airdrop seems to be improved between iOS devices (used to be crap) in terms of both speed and reliability. But I still have to test it with an el Capitan Mac. I guess your problem could be on the Mac side, since it still runs Yosemite, which had a very buggy implementation.
Ok, to quote myself. I've tested it.
- It didn't work between 9.0 and 10.11.0 devices.
- However it works fine between 9.1 and 10.11.1, at least for small files (if this can be confirmed by other users we could start building some statistics).
Anyway...we can only hope that at some point airdrop will just work across devices and OS versions.
1) The first step is that it works on every bt4 device running the latest operating system; That should be our baseline. How far are we from that now? Are we already there? Even though Airdrop SEEMS to work for me now, my sample is too small and I've already read about other people still having problems. Let's try to state the exact OS versions and specs of our devices.
2) From that point forward (present of future) it should keep working even, for example, between an iOS 11.2 device trying to send a file to OsX 10.12.0.
At some point it has to reach that point of maturity, you can't expect that it works only when the OS is updated to the latest version!
What would we think about a pendrive that works like that?
"Can you give me that PDF?"
"Sure, I'll put it in my USB pen!"
"Mmm...doesn't work..."
"Well, i formatted the pen on el Capitan, you are still on Yosemite, of course it doesn't work!!"
"No! Actually I updated yesterday, I'm on el Cap!"
"Oh, well...this morning we got 10.11.1 and I have updated before formatting the pendrive...err, maybe you have to be on 10.11.1 as well...then it will work...hopefully..."
"Oh...go to hell!"
And that's why selling a 1500 laptop with no ports (almost) and a 1300 iPad Pro with no ports, while saying "nobody needs ports, just use airdrop, wifi ac is SUPER FAST!!" is a blind and stupid attitude (but what do I know, I don't make billions of profits every quarter, so I must be the stupid one, right?)
Anyway... First we need to understand if it finally works at the 9.1-10.1.1 level, then we can only hope that it will not break with updates and that compatibility will resist between different OS versions from here on.
My devices:
- 2014 13" Macbook Air, OSX 10.11.1 → works with my iOS devices.
- iPad Air 2, iOS 9.1 → works with my iPhone and 2014 Macbook Air.
- iPhone 6s, iOS 9.1 → works with my iPad and 2014 MacBook Air.
- 2012 15" retina MacBook Pro, on Mavericks → doesn't work, neither with iOS devices (expected, as they are unsupported with Mavericks) nor with my MBA.
* Being connected to a wifi network (or not) doesn't seem to alter these results.
* Big files (> 1gb), not tested yet.