iPhoto not uploading shared content to iCloud
I was uploading a large number of pics to my iMac when I ran out of storage. The local Apple shop helped get me an external drives and then transfer over the pics that I had. Since this happened, I'm unable to share anything on iCloud. Does anyone know how to fix this? I've selected the pics, entered in the email addresses and nothing goes out to friends/family. Thanks
iMac, OS X Yosemite (10.10.2)