My son sent me an e-mail with a pdf attachment which he wanted printed as his printer was u/s. Message arrived with a paperclip to indicate an attachment. However no attachment was visible. He sent it twice to no avail, fortunately I happened to look at my e-mails on my iPhone 5s and there were the messages with pdfs attached. !! I was then able to print them from the iPhone. My Mac is running Mavericks 10.9.5, the iPhone is on Ios 8.4.1. Any suggestions why the iMac did not get the attachments? Should I upgrade?