Discounting the fact that Airdrop only works on Macs (sending to a Windows machine or an Android phone doesn't work, even though those devices both support Blue

Discounting the fact that Airdrop only works on Macs (sending to a Windows machine or an Android phone doesn't work, even though those devices both support Bluetooth file transfers), I've never even been able to get Airdrop to work on my Mac. As for emailing files: that's all fine if your images are in the Camera roll. But try emailing and image and a PDF together, or an image from a different app.