cancelled pdf transfer from yosemite mac to iOS device via airdrop

I can send pictures from my mac to my iOS devices via airdrop. But when I try to send a pdf, it is not working. After a while I get a message on the iOS device saying that the transfer has been canceled. On the mac, I get a message saying that the iOS device has refused transfer. Is it normal? Is there a way to send my documents via airdrop (i know I can use dropbox but sometimes I do not have access to internet)?